Fits select 1959-1964 Chevrolet full-size models, including Bel Air, Biscayne, Impala, El Camino, and various wagons (Brookwood, Kingswood, Nomad, Parkwood).

The Ridetech HQ Series Rear CoilOver and StrongArm system is a complete suspension overhaul designed to modernize the handling, stance, and ride quality of 1959-1964 GM X-frame vehicles. This kit replaces the compliant, stamped-steel factory control arms with heavy-duty tubular StrongArms, providing superior strength and optimized suspension geometry for better traction and stability. The included adjustable panhard bar ensures the rear axle remains perfectly centered, even at lower ride heights.

The heart of this system is the HQ Series CoilOvers, which feature single-adjustable rebound damping. This allows you to fine-tune the shock valving to match your specific driving style or vehicle weight. All components are designed for a direct bolt-on installation, utilizing factory mounting points to simplify the upgrade process.

• HQ Series Shocks: Features 24-position rebound adjustment for precise tuning of ride and handling.
• Tubular StrongArms: Upper and lower arms provide increased strength and improved suspension geometry over OE stampings.
• Adjustable Panhard Bar: Allows for lateral axle centering, critical for maintaining proper wheel alignment.
• Complete Hardware: Includes all necessary brackets, springs, and grade 8 hardware for a full installation.
• MPN: 11066210

Fits select 1959-1964 Chevrolet Impala, Bel Air, Biscayne, El Camino, and wagons (Kingswood, Nomad, Parkwood, Brookwood, and Sedan Delivery).

The Ridetech HQ Series Coil-Over System is a comprehensive suspension solution designed to modernize the handling and ride quality of your 1959-1964 B-Body. This system replaces the outdated factory components with precision-engineered StrongArms to improve suspension geometry and eliminate flex. The included HQ Series Coil-Overs provide adjustable rebound damping, allowing you to fine-tune the suspension for specific driving conditions or comfort preferences. To ensure flat cornering and reduced body roll, this package also features heavy-duty front and rear sway bars.

• Manufacturer Part Number: 11060202
• Coil-Overs: HQ Series front and rear with impact-forged aluminum bodies and adjustable rebound damping
• Control Arms: Front upper and lower StrongArms with optimized ball joint angles
• Rear Suspension: Upper and lower StrongArms to improve axle positioning and traction
• Sway Bars: Matched front and rear bars for increased roll stiffness
• Installation: Bolt-on design for factory mounting points

Fits select 1958-1964 Chevrolet full-size models, including Bel Air, Biscayne, El Camino, and Impala. This Ridetech HQ Series Rear CoilOver Upgrade (MPN 11056210) provides a modern suspension solution to improve ride quality and handling performance on your classic B-Body vehicle.

This comprehensive kit replaces the factory spring and shock configuration with adjustable coilovers and reinforced lower control arms. The HQ Series shocks feature a large piston diameter and a 24-position rebound adjustment, allowing you to fine-tune the damping to your specific driving preferences or track conditions. The included lower StrongArms provide the necessary strength and clearance for the coilover conversion while maintaining proper suspension geometry.

• HQ Series Coil-Overs with impact-forged aluminum bodies and rebound adjustment
• Heavy-duty lower StrongArms designed for coilover mounting
• Model-specific mounting brackets for a secure installation
• High-tensile steel springs with optimized rates for street and performance use
• All necessary grade 8 mounting hardware included
• Manufacturer Part Number: 11056210

Fits select 1958-1964 Chevrolet Bel Air, Biscayne, Brookwood, Del Ray, El Camino, Impala, Kingswood, Nomad, Parkwood, Sedan Delivery, and Yeoman.

The Ridetech HQ Series Front CoilOver system delivers high-performance handling and tunable ride quality for classic GM B-Body applications. These coilovers are engineered specifically for use with Ridetech lower control arms, providing a modern suspension solution that replaces outdated factory spring and shock configurations. The HQ Series (Handling Quality) shocks feature a monotube design with manual rebound adjustment, allowing you to dial in the damping characteristics to suit your specific driving environment.

• Rebound Adjustability: Features 24-position rebound adjustment to fine-tune ride quality and handling response.
• Premium Construction: High-quality coil springs paired with impact-forged shock bodies for consistent performance under load.
• Anti-Friction Design: Includes Delrin spring washers to reduce friction and prevent spring binding during adjustment or compression.
• Bolt-On Integration: Specifically designed to mount to Ridetech lower control arms for a simplified installation process.

Includes: (2) Rebound adjustable HQ Series shocks, (2) coil springs, spring mounts, and Delrin spring washers. Manufacturer Part Number: 11053510.

Fits 1955-1957 Chevrolet Bel Air, One-Fifty Series, and Two-Ten Series with Ridetech Bolt-On 4-Link suspension.

The Ridetech HQ Series Rear CoilOver Pair is engineered to provide superior handling and ride quality for Tri-Five Chevrolets equipped with the Ridetech Bolt-On 4-Link system. These coilovers replace standard shocks and springs with a high-performance monotube design featuring impact-forged aluminum bodies for exceptional strength and heat dissipation.

Each shock in the HQ (Handling Quality) series offers 24 positions of rebound adjustment, giving you the ability to fine-tune your suspension to your specific driving style or road conditions. The included high-tensile springs are paired with Delrin spring washers to eliminate binding and noise during compression, ensuring smooth and consistent operation.

• Designed specifically for use with Ridetech Bolt-On 4-Link systems
• 24-position rebound adjustment for precise ride tuning
• Impact-forged monotube aluminum shock bodies
• Includes high-tensile springs and mounting hardware
• Delrin spring washers prevent spring binding
• Manufacturer Part Number: 11016510

Fits 1955-1957 Chevrolet Bel Air, One-Fifty Series, Two-Ten Series, and Sedan Delivery.

Upgrade your Tri-Five Chevy’s front suspension with this pair of Ridetech HQ Series CoilOvers. These units are engineered to provide superior handling and ride quality through 24-position rebound adjustability, allowing you to fine-tune the damping for your specific driving style. Specifically designed for use with Ridetech lower control arms, these coilovers feature a monotube design for consistent, fade-free performance.

• Includes 24-position rebound adjustable shocks for precise damping control
• High-tensile springs included for optimized ride height and support
• Includes spring mounts and Delrin spring washers for smooth, quiet operation
• Designed for seamless integration with Ridetech lower arms
• Manufacturer Part Number: 11013510

Fits 2013-2018 Scion FR-S, Subaru BRZ, and Toyota 86.

The Revel Touring Sport Damper is engineered for enthusiasts seeking the perfect balance between spirited performance and daily-driver comfort. This coilover system allows for precise height adjustability, enabling you to lower your vehicle's center of gravity to reduce body roll and improve steering response. Designed with street-friendly damping rates, these dampers maintain ride quality while providing the control needed for performance driving.

• Manufacturer Part Number: 1TR3CDSU001
• Touring Sport series focused on street comfort and balanced handling
• Full length adjustability for independent ride height and spring preload settings
• Monotube design for consistent damping performance and heat dissipation
• Direct-fit replacement for factory struts and springs

Fits 1998-2005 Lexus GS300, GS400, and GS430 (Base models).

The Revel Touring Sport Damper kit is engineered to provide a balanced blend of performance-oriented handling and daily driving comfort for the second-generation Lexus GS chassis. This coilover system replaces the factory struts and springs, offering a more controlled ride and improved road feel without the harshness often associated with track-only setups. Designed for a precise fit, these dampers allow you to refine your vehicle's stance and cornering dynamics while maintaining the premium feel expected of a Lexus sedan.

• Manufacturer Part Number: 1TR3CDLX004
• Product Series: Touring Sport Damper
• Application: Replaces factory suspension for improved handling and ride height control
• Compatibility: Engineered for 1998-2005 Lexus GS-Series platforms

Fits select 1978-1996 Buick, Chevrolet, Oldsmobile, and Pontiac B-Body models, including Caprice, Impala SS, Roadmaster, and Delta 88.

Convert your GM B-Body's factory rear suspension to a modern coil-over setup with the QA1 Pro Rear Coil-Over System. This bolt-in conversion kit replaces standard shocks and springs with adjustable aluminum coil-overs, providing significant improvements in both stance and handling. The single-adjustable shocks feature 18 positions of simultaneous rebound and compression tuning, allowing you to dial in the perfect balance for street cruising or performance driving. The fully threaded shock bodies offer precise ride height adjustability, ranging from 0.5 inches higher than stock to a 2.25-inch drop.

This kit includes QA1 lightweight high-travel springs, designed with fewer coils and a smaller wire diameter to reduce unsprung weight and prevent coil bind. Each system is 100% dyno-tested and serialized to ensure consistent performance across both units.

• Manufacturer Part Number: RCK52385
• Adjustment Type: Single Adjustable (18 positions)
• Spring Rate: 300 lbs/in
• Spring Length: 12 inches
• Shock Material: Machined Aluminum
• Installation: Direct Bolt-In (No cutting or welding required)
• Lowering Range: 0.5" above stock to 2.25" below stock
• Kit Includes: (2) Shocks, (2) High-Travel Springs, Mounting Brackets, and Hardware
• Origin: Made in the USA

Fits select 1978-1996 GM B-Body models including Chevrolet Caprice and Impala, Buick Roadmaster and LeSabre, Oldsmobile Delta 88, and Pontiac Bonneville.

Transform your vehicle's handling and stance with the QA1 Pro Rear Coil-Over Conversion System. This bolt-in kit replaces factory shocks and springs with a fully adjustable performance setup designed to improve weight balance and suspension response. The double-adjustable aluminum shocks feature 18 positions of independent compression and rebound adjustment, providing 324 unique valving combinations to bridge the gap between street comfort and track performance.

The system includes American-made, lightweight high-travel springs with a 250 lbs/in rate. These springs utilize fewer coils and a smaller wire diameter to increase travel and reduce unsprung weight. With a fully threaded shock body, you can easily adjust your ride height from 0.5 inches higher than stock to 2.25 inches lower than stock to achieve the perfect center of gravity.

• Manufacturer Part Number: RCK52380
• Double adjustable shocks with 324 valving combinations
• 12-inch x 250 lbs/in high-travel springs
• Lightweight, hard-anodized aluminum shock bodies
• Ride height adjustable from +0.5" to -2.25"
• 100% dyno tested and serialized
• Rebuildable and revalveable by QA1 service centers
• Complete bolt-in installation with no cutting or welding required
• Includes 2 shocks, 2 springs, mounting brackets, and all necessary hardware
• Limited Lifetime Warranty

Fits select 1978-1988 Buick Regal, Chevrolet Malibu, Monte Carlo, El Camino, GMC Caballero, and Pontiac Bonneville/Grand Prix.

The QA1 Rear Pro-Coil Double Adjustable Kit provides a comprehensive suspension upgrade for GM G-Body platforms, replacing factory rear shocks and springs with a versatile coil-over system. These kits are engineered to provide independent control over compression and rebound settings through double-adjustable valving, allowing for precise chassis tuning for both street performance and drag racing applications. The threaded shock bodies facilitate easy ride height adjustments, enabling you to achieve your desired stance in minutes.

• Double-adjustable valving for independent compression and rebound tuning
• Adjustable ride height: 1/2" higher than stock to 2.25" lower than stock
• Sold as a pair including shocks and 12-200 series springs
• Bolts to factory mounting points for straightforward installation
• Made in the USA
• Manufacturer Part Number: RCK52367

Fits 1971-1976 Chevrolet Caprice and Impala models including Base, Classic, Landau, Sport, and Estate variants.

The QA1 Pro-Coil Rear Kit provides a direct bolt-in solution to convert your GM B-Body suspension to a modern coil-over setup. This kit replaces factory shocks and springs with adjustable units, allowing you to fine-tune both your vehicle's stance and its handling characteristics for the street or the track. Engineered for performance and ease of installation, these coil-overs offer a significant upgrade over aged OE components.

• Adjustable Ride Height: Dial in your preferred stance with a height range from 0.5" higher than stock down to 2.25" lower than stock.
• Valving Versatility: Features adjustable rebound and compression valving, allowing you to firm up the suspension for performance or soften it for cruising with the twist of a knob.
• Axle Compatibility: Designed to work with factory rear housings or Quick Performance 9" rear axles.
• Direct Installation: A true bolt-in kit that includes all necessary hardware for installation in a standard home garage or professional shop.
• Technical Specs: Manufacturer Part Number RCK52364; Includes 12-250 series springs; Double-adjustable (D-Adj) valving architecture.
• Quality Assurance: Proudly made in the USA and backed by a limited lifetime warranty; sold as a pair.

Fits select 1964-1972 GM A-Body and G-Body vehicles, including Chevrolet Chevelle, El Camino, Monte Carlo, Pontiac GTO, LeMans, Oldsmobile Cutlass, 442, and Buick Skylark.

The QA1 Pro Rear Coil-Over System is a complete bolt-in conversion designed to modernize your classic GM suspension. This kit replaces the factory separate shock and spring setup with a fully adjustable coil-over configuration, providing significant improvements in both handling and stance. The single-adjustable aluminum shocks feature 18 positions of simultaneous rebound and compression valving, allowing you to fine-tune your ride quality and performance with a simple knob adjustment.

Each kit features lightweight billet aluminum shocks with a fully threaded body for precise ride height control, ranging from 0.5 inches above factory height to a 2.25-inch drop. The included 150 lb/in high-travel springs are paired with vehicle-specific, USA-made mounting brackets to ensure a straightforward installation without the need for custom fabrication.

• Manufacturer Part Number: RCK52340
• Adjustment Type: Single Adjustable (18 valving positions)
• Spring Rate: 150 lbs/in
• Spring Length: 12 inches
• Ride Height Range: +0.5" to -2.25" vs. stock
• Material: Billet aluminum shock body; steel mounting hardware
• Construction: 100% dyno tested and serialized; fully rebuildable and serviceable
• Origin: Made in the USA
• Warranty: Limited Lifetime Warranty

Includes a pair of shocks, high-travel springs, mounting brackets, and all necessary installation hardware.

Fits select 1964-1972 GM A-Body and G-Body vehicles including Chevrolet Chevelle/El Camino, Pontiac GTO/LeMans, Oldsmobile Cutlass/442, and Buick Skylark.

Transform your vehicle's rear suspension with the QA1 Pro Rear Coil-Over Conversion Kit. This bolt-in system replaces traditional shocks and springs with a fully adjustable setup, providing the ultimate balance of ride quality and performance handling. These double-adjustable aluminum shocks feature independent 18-position knobs for both compression and rebound, offering 324 total valving combinations to suit street performance, drag racing, or autocross applications.

The lightweight billet aluminum shocks utilize a fully threaded body for precise ride height adjustment, allowing you to achieve a stance ranging from 0.5 inches higher than stock to 2.25 inches lower. Each kit is manufactured in the USA, 100% dyno tested, and remains fully serviceable and rebuildable for long-term reliability.

• Valving: Independent double-adjustable (18 positions rebound / 18 positions compression).
• Spring Rate: 170 lbs/in high-travel springs.
• Adjustability: 12-inch shock length with threaded body for ride height tuning (+0.5" to -2.25").
• Materials: Lightweight billet aluminum shocks and USA-made mounting brackets.
• Serviceability: Serialized, 100% dyno tested, and rebuildable.
• Warranty: Manufacturer Limited Lifetime Warranty.
• MPN: RCK52337

Includes: A pair of double-adjustable shocks, high-travel springs, mounting brackets, and all required installation hardware.

Fits select 1964-1972 Buick, Chevrolet, GMC, Oldsmobile, and Pontiac A-Body and G-Body vehicles. This bolt-in Rear Coil-Over Conversion Kit replaces your factory rear suspension setup with a high-performance, adjustable system designed for superior handling and stance control.

The QA1 Pro Rear Coil-Over System (RCK52336) features double-adjustable aluminum shocks, providing independent control over both rebound and compression. With 18 positions for each, you can access 324 possible valving combinations to tune your vehicle for anything from casual street cruising to aggressive track use. The shocks utilize a fully threaded billet aluminum body, allowing for precise ride height adjustments ranging from 0.5" higher than stock down to 2.25" lower than stock.

Each kit is manufactured in the USA and include specially designed mounting brackets and high-travel springs for a complete, bolt-on installation. Every shock is 100% dyno tested and serialized to ensure consistent performance across the pair.

• Manufacturer Part Number: RCK52336
• Adjustment Type: Double Adjustable (18 positions compression, 18 positions rebound)
• Valving Combinations: 324
• Spring Rate: 150 lbs/in
• Spring Length: 12in
• Shock Material: Lightweight Billet Aluminum
• Ride Height Range: +0.5" to -2.25" from stock
• Origin: Made in the USA
• Warranty: Limited Lifetime Warranty

Includes a pair of shocks, springs, mounting brackets, and all necessary installation hardware.

Fits 1965-1972 Ford F-100 Base models.

Transform the handling and stance of your classic truck with the QA1 R120-200 Rear Coil-Over Conversion System. This bolt-in kit replaces the factory leaf spring suspension with a high-performance torque arm design, specifically engineered to eliminate binding and provide a smooth, controlled ride. This system allows for a significant 4-inch to 7-inch drop, giving you the ability to achieve the exact ride height and rake your build requires.

The R120-200 system offers total independent adjustability. The panhard bar, torque arm, trailing arms, and bracket mounts can be tuned without affecting one another, allowing for precise chassis setup. The included single adjustable shocks come with 200 lb/in springs and are 100% dyno tested and serialized to ensure consistent performance out of the box.

• Complete bolt-in installation with all necessary hardware included
• Provides 4" to 7" of ride height adjustability
• Independent torque arm design eliminates suspension binding
• Single adjustable shocks for simplified tuning of compression and rebound
• Includes 200 lbs/in coil-over springs
• Manufactured in QA1's Lakeville, Minnesota facility
• Manufacturer Part Number: R120-200

Fits 2003-2011 Ford Crown Victoria models including Base, LX, Police Interceptor, and LX Sport.

The QA1 Pro Coil System provides a direct-fit solution for 2003-2011 Crown Victoria owners looking to upgrade their front suspension with adjustable ride height and valving control. These single-adjustable coil-overs feature a lightweight billet aluminum body that is fully threaded, allowing for precise height adjustment to achieve the perfect stance or to fine-tune weight balance for improved handling characteristics.

Engineered for ease of use, these shocks allow you to adjust valving to match your driving style. Every shock is 100% dyno tested and serialized to ensure consistent performance out of the box. Designed as a bolt-in upgrade, this system eliminates the guesswork of matching separate shocks and springs while offering a serviceable and rebuildable design for long-term durability.

• Single-adjustable shocks for simultaneous compression and rebound tuning
• Lightweight billet aluminum construction for reduced unsprung weight
• Includes 9-inch springs with a 650 lbs/in spring rate
• Fully threaded shock body for adjustable ride height
• 100% dyno tested and serialized by QA1
• Serviceable and rebuildable by QA1 authorized centers
• Easy bolt-in installation to factory points
• Made in the USA
• Manufacturer Part Number: MS431-09650

Fits 2003-2011 Ford Crown Victoria models including Base, LX, Police Interceptor, and Special Edition.

The QA1 Pro Coil System provides a bolt-in solution for 2003-2011 Ford Crown Victoria owners looking to achieve precise ride height control and suspension tuning. These single-adjustable front coilovers feature a lightweight billet aluminum threaded body that allows you to set the perfect stance and corner balance your vehicle for superior handling. Each system is equipped with 9-inch springs featuring a 550 lbs/in rate, ideal for maintaining stability and performance in various driving conditions.

• Manufacturer Part Number: MS431-09550
• Lightweight billet aluminum coil-over shocks
• Single adjustable valving controls compression and rebound simultaneously
• 9-inch high-performance springs with 550 lbs/in spring rate
• Fully threaded shock body for ride height adjustability
• 100% dyno tested and serialized for consistency
• Serviceable and rebuildable by QA1 authorized service centers
• Direct bolt-in installation for ease of use
• Proudly made in the USA

Fits 2003-2011 Ford Crown Victoria models, including Police Interceptor, LX, and LX Sport trims.

The QA1 Pro Coil System (MPN MS431-09450) provides precision ride height and valving control for the front suspension of your Ford Crown Victoria. Engineered for a direct, bolt-in installation, this system features a single-adjustable shock that allows you to tune the rebound and compression simultaneously. The fully threaded billet aluminum shock body provides the flexibility to set your stance exactly where you want it while improving overall vehicle weight balance and handling response.

• Spring Rate: 450 lbs/in with a 9-inch spring length.
• Adjustability: Single-adjustable valving for synchronized damping control.
• Construction: Lightweight billet aluminum shock bodies with a threaded exterior.
• Quality Assurance: 100% dyno tested and serialized for performance consistency.
• Serviceability: Fully rebuildable and serviceable by QA1 authorized centers.
• Manufacturing: Proudly made in the USA.
• Part Number: MS431-09450

Fits 1967-1973 Ford Mustang models, including Base, Mach 1, Grande, Boss 302/351/429, and Shelby GT-350/GT-500.

The QA1 Pro Coil System is a high-performance front suspension upgrade designed to modernize the handling and stance of classic Mustangs. This single-adjustable kit features lightweight aluminum shock bodies paired with 10-inch coil springs at a 450 lb/in rate. This specific spring rate is engineered for aggressive street performance and restomod applications, providing maximum roll control and sharp steering response.

The system utilizes a single adjustment knob to simultaneously fine-tune rebound and compression through 18 valving settings, allowing you to quickly transition from a comfortable cruise to a firm track setup. The threaded shock body enables precise ride height adjustments from factory stock height down to a 2-inch drop. Designed as a direct bolt-in solution, this kit installs into factory mounting locations without the need for cutting or welding.

• Manufacturer Part Number: MS402-10450C
• Damping Control: Single adjustable with 18 rebound/compression settings
• Spring Specifications: 10-inch length with 450 lb/in spring rate
• Ride Height Range: Factory stock to -2 inches
• Materials: Machined aluminum shock body and powder-coated high-tensile steel springs
• Compatibility: Works with factory or QA1 tubular control arms and sway bars
• Installation: Direct bolt-in; no welding or chassis modification required

Fits 1967-1973 Ford Mustang (Base, Boss, Grande, Mach 1, and Shelby models).

The QA1 Pro Coil System provides a precision front suspension upgrade for classic Mustangs, combining damping adjustability with ride height control. This single-adjustable system allows you to fine-tune both compression and rebound simultaneously via 18 distinct settings, making it easy to transition from comfortable street cruising to firm, responsive handling. The kit features an aluminum-bodied shock and a 10-inch, 400 lb/in coil spring designed to support restomod and street-performance builds.

Engineered as a direct bolt-in solution, this system requires no welding or major modifications to your chassis. It offers a ride height adjustment range from factory stock down to 2 inches lower, allowing you to achieve the perfect stance while improving suspension geometry and tire fitment.

• Damping Control: Single adjustable knob with 18 settings for simultaneous rebound and compression tuning.
• Spring Specs: 10-inch length with a 400 lb/in spring rate, ideal for street performance.
• Premium Materials: Lightweight aluminum shock bodies and powder-coated springs for long-term durability.
• Ride Height Range: Adjusts from factory height to -2 inches.
• Installation: Bolt-in design; compatible with factory or QA1 tubular control arms.
• MPN: MS402-10400C

Fits 1964-1966 Ford Mustang Base and Shelby GT-350/GT-350H models.

The QA1 Pro Coil System is a comprehensive front suspension upgrade designed to replace outdated factory shock and spring configurations with modern, adjustable performance. This kit provides a significant improvement in handling and ride quality, allowing owners of classic 1964-1966 Mustangs to bridge the gap between vintage style and contemporary driving dynamics. The system features lightweight aluminum shocks with a single-adjustable knob, giving you simultaneous control over 18 settings of rebound and compression damping to suit your specific driving environment.

Engineered for a true bolt-in installation, this system requires no cutting, welding, or chassis fabrication. It integrates seamlessly with either factory control arms or QA1 tubular components. The included 10-inch high-tensile springs feature a 350 lb/in rate, ideal for street performance and restomod applications. This system also enables precise stance tuning, offering ride height adjustability from stock level down to a 2-inch drop.

• Manufacturer Part Number: MS401-10350C
• Adjustment Type: Single Adjustable (18 valving settings)
• Spring Rate: 350 lbs/in
• Spring Length: 10 inches
• Ride Height Range: Stock to -2" lowering
• Material: Lightweight machined aluminum shock bodies
• Installation: Direct bolt-on; compatible with factory or QA1 control arms
• Hardware: Includes all necessary premium mounting hardware

Fits all 1997-2013 Chevrolet Corvette models, including Base, Z06, ZR1, Grand Sport, and special editions (V8-5.7L / V8-6.0L / V8-6.2L / V8-7.0L).

Replace your Corvette's factory transverse leaf spring suspension with the QA1 MOD Series Pro-Coil conversion kit. Designed for high-performance street and competitive track use, these 4-way adjustable coilovers allow for independent tuning of high-speed and low-speed compression and rebound. The modular design features QuickTune technology, utilizing dry valve packs that can be swapped without removing the shocks from the car or exposing the oil to contaminants.

The nitrogen-charged piggyback canisters are engineered to clear factory suspension geometry without requiring a toe link relocation kit. This system allows for precise ride height adjustments, offering a 1.0" to 2.0" drop on base models and a 0.5" to 1.5" drop on Z06 models to lower the center of gravity and improve corner balancing.

• 4-way adjustable high and low-speed bleed for precise weight transfer control
• QuickTune modular valve packs for rapid, track-side re-valving
• 8-inch high-tensile springs with a 550lb/in rate and 2.25" ID
• Hard-anodized aluminum shock bodies with piggyback canisters
• 100% dyno tested and serialized
• Bolt-on installation using factory mounting points
• Note: Models equipped with electronic ride control require Real Time Damping (RTD) simulators
• Manufacturer Part Number: MG455-08550
• Made in the USA

Fits select 1967-1974 Buick Apollo, Chevrolet Camaro and Nova, Oldsmobile Omega, and Pontiac Firebird and Ventura.

The QA1 MOD Series GM Pro Front Coil-Over System offers an unprecedented level of tunability for classic GM F-body and X-body platforms. Engineered for high-performance handling and stance control, this system features QA1's innovative QuickTune Technology. These dry modular valve packs allow you to swap valving in minutes without unsealing the shock, interrupting the oil path, or risking air contamination. Once your base valving is set, the 4-way adjustable design provides independent control over high-speed and low-speed compression and rebound via an adjustable low-speed bleed.

Built from high-grade aluminum, the MG401-10450A utilizes a nitrogen-charged canister available in piggyback or remote configurations to fit tight wheel wells. The base eyelet is fully indexable, allowing you to unbolt and reorient the canister for the best possible clearance. Each shock is 100% dyno tested and serialized at QA1's Minnesota facility to ensure consistent performance out of the box.

• QuickTune Technology: Modular dry valve packs for easy valving changes without oil loss.
• Adjustability: 4-way independent high and low-speed bleed for precise force curve tuning.
• Construction: Lightweight aluminum body with a 10-inch, 450lbs/in pigtail spring.
• Versatile Mounting: Indexable base eyelet and flexible canister mounting (piggyback or remote).
• Quality Assurance: 100% dyno tested and serialized; made in the USA.
• Part Number: MG401-10450A

Fits 1967-1973 Ford Mustang models, including Base, Boss 302/351/429, Grande, Mach 1, and Shelby GT-350/GT-500/GT-500KR.

The QA1 Pro Coil System transforms the front suspension of your classic Mustang with modern double-adjustable damping technology. This kit features lightweight aluminum shocks with independent rebound and compression controls, allowing you to fine-tune the suspension for street comfort or track-ready handling without removing the shocks from the vehicle. The included 10-inch high-tensile springs are rated at 400 lbs/in, providing an ideal balance for restomod builds and performance-oriented street cars.

Engineered as a direct bolt-in solution, this system requires no welding or cutting for installation. The threaded shock bodies provide ride height adjustability from factory stock height down to a 2-inch drop, giving you total control over the vehicle's stance and center of gravity while maintaining proper suspension geometry.

• Manufacturer Part Number: MD402-10400C
• Double adjustable shocks with 18 independent rebound and 18 compression settings
• 10-inch coil springs with a 400 lb./in. spring rate
• Ride height adjustable from factory height to 2-inches lower
• Lightweight aluminum shock bodies with premium hardware
• Direct bolt-in installation with no welding required
• Compatible with QA1 tubular control arms and sway bars

Fits select 1999-2006 Chevrolet Silverado 1500 and GMC Sierra 1500 models, including Base, LS, LT, SS, SLE, SLT, and Denali trims.

The QA1 Pro Coil System (MPN: GS517-10650C) offers a significant suspension upgrade for GMT800-platform trucks, providing precision ride height control and valving adjustment. This single-adjustable system features a single knob that simultaneously adjusts both compression and rebound damping, allowing you to dial in ride quality and handling performance for street or track use. The lightweight billet aluminum shock bodies are fully threaded, providing up to 2 inches of ride height adjustment to achieve the ideal stance or weight balance.

• Single adjustable valving (rebound and compression adjusted simultaneously)
• 10-inch high-travel springs with a 650 lbs/in spring rate
• Lightweight billet aluminum shock construction
• Easy bolt-in installation compatible with factory or QA1 tubular control arms
• 100% dyno tested and serialized
• Fully serviceable and rebuildable by QA1 authorized centers
• Proudly made in the USA
• Includes a Limited Lifetime Warranty

Fits select 1958-1996 Chevrolet, Ford, Mercury, and Edsel full-size vehicles including Impala, Caprice, Galaxie, and Monterey.

The QA1 GM Pro Coil System provides a direct bolt-in suspension upgrade for classic full-size platforms, offering precise control over ride height and valving. This system replaces the factory shock and spring with a billet aluminum coil-over assembly, allowing for up to 2 inches of ride height adjustment to dial in the perfect stance or optimize weight distribution. The single adjustable valving design features a single knob that simultaneously adjusts compression and rebound, making it easy to tune for street performance, drag racing, or autocross.

Each kit includes high-travel springs manufactured in the USA. These lightweight springs use fewer coils and a smaller wire diameter than standard springs to reduce unsprung weight and provide more suspension travel without coil bind. The shocks are 100% dyno tested and serialized to ensure consistent performance out of the box.

• Manufacturer Part Number: GS507-10750C
• Adjustment: Single adjustable (simultaneous compression and rebound)
• Spring Rate: 750 lbs/in
• Spring Length: 10 inches
• Shock Material: Lightweight Billet Aluminum
• Ride Height: Up to 2 inches of adjustment
• Mounting: Bolt-in installation; works with factory or QA1 control arms
• Serviceability: Rebuildable and serviceable by QA1 authorized centers
• Quantity: Sold in pairs
• Warranty: Limited Lifetime Warranty

Fits select 1958-1996 Chevrolet, Ford, Mercury, and Edsel full-size models (see fitment table for specific submodel and chassis applications).

The QA1 GM Pro Coil-Over System provides a direct-fit solution for drivers seeking simultaneous control over compression and rebound valving. This single-adjustable system features lightweight billet aluminum shocks and high-travel springs, allowing you to fine-tune your vehicle's stance and handling characteristics for street performance, drag racing, or autocross. The fully threaded shock bodies offer up to 2 inches of ride height adjustment to achieve the perfect center of gravity and weight balance.

• Adjustable Valving: Single-knob simultaneous adjustment of compression and rebound for simplified tuning.
• Billet Aluminum Shocks: Lightweight, durable construction, 100% dyno tested and serialized.
• High-Travel Springs: American-made springs with fewer coils and smaller wire diameters for increased travel and reduced unsprung weight.
• Spring Specifications: 10-inch length with a 550 lbs/in rate, ideal for front-heavy full-size applications.
• Serviceable Design: Shocks are fully rebuildable and serviceable by QA1 authorized centers.
• Easy Installation: Direct bolt-in design compatible with factory or QA1 tubular control arms.
• Part Number: GS507-10550C
• Origin: Proudly made in the USA.

Fits 1963-1982 Chevrolet Corvette models (Base, Collector's Edition, Indianapolis 500 Pace Car, Silver Anniversary Edition, and Stingray).

The QA1 GM Pro Front Coil-Over System provides a direct bolt-in solution to modernize the front suspension of your C2 or C3 Corvette. This single-adjustable system features a single knob that simultaneously adjusts compression and rebound valving, allowing you to dial in the perfect ride quality for street performance or track use. The lightweight billet aluminum shock bodies are fully threaded, enabling up to 2 inches of ride height adjustment to achieve a specific stance or to fine-tune weight balance.

This kit includes American-made high-travel springs, specifically engineered with a smaller wire diameter and fewer coils to reduce unsprung weight and react faster to road surfaces. Each shock is 100% dyno-tested and serialized to ensure precision performance. Whether you are running factory control arms or upgraded QA1 tubular arms, this system integrates seamlessly into your existing setup.

• Valving: Single adjustable (simultaneous compression and rebound)
• Spring Specs: 9-inch length with a 650 lbs/in rate
• Spring Seat: Pigtail Large design
• Construction: Lightweight billet aluminum shock bodies
• Adjustment: Up to 2 inches of ride height adjustment
• Installation: Easy bolt-in design; no welding or cutting required
• Serviceability: Fully rebuildable and serviceable
• Warranty: Limited Lifetime Warranty
• Origin: Made in the USA
• MPN: GS507-09650D

Fits 1963-1982 Chevrolet Corvette models including Base, Stingray, Silver Anniversary, and Collector's Edition.

The QA1 GM Pro Coil System provides a direct-fit solution for Corvette owners seeking precise control over ride height and damping. This front suspension kit features a single-adjustable knob that simultaneously tunes compression and rebound valving, allowing you to quickly dial in the suspension for street performance or track days. The billet aluminum shocks feature a fully threaded body, providing up to 2 inches of ride height adjustment to achieve the ideal stance or optimize corner weighting.

Each kit includes QA1 high-travel springs, manufactured in the USA from lightweight wire for increased travel and reduced unsprung weight. The pigtail-style spring design ensures proper seating in the factory spring pocket. These shocks are 100% dyno tested and serialized to ensure consistent performance across the pair.

• Manufacturer Part Number: GS507-09550D
• Adjustment: Single Adjustable (Simultaneous Compression and Rebound)
• Spring Rate: 550 lbs/in
• Spring Length: 9 inches
• Shock Material: Lightweight Billet Aluminum
• Spring Design: High Travel Pigtail Large
• Installation: Easy Bolt-In; compatible with factory or QA1 tubular control arms
• Serviceability: Fully rebuildable and serviceable by QA1 authorized centers
• Quantity: Sold as a pair