This QA1 C Series 2-piece rod end provides a reliable, high-strength solution for mechanical linkages, steering components, and custom suspension setups. Constructed from durable carbon steel, this male-threaded rod end is engineered to maintain precise alignment and withstand static loads in demanding automotive and industrial environments.

The traditional two-piece design ensures consistent performance for non-critical applications where a metal-to-metal interface is required. Each unit comes complete with a matching jam nut to provide a secure, vibration-resistant lock once your length adjustment is set.

• Series: QA1 C Series
• Part Type: 2-Piece Rod End (Heim Joint)
• Thread Configuration: Male, Right Hand (RH)
• Thread Size: 1/2-20
• Bore Diameter: 0.500 inch
• Material: Carbon Steel
• Included Hardware: Jam Nut

Ensure precise spring alignment and reliable performance with the QA1 Coil-Over Spring Seat. Designed specifically for use with 2.5-inch inside diameter (ID) coilover springs, this cone-style seat provides a stable foundation for your suspension setup, allowing for smooth ride height adjustments and consistent spring loading.

• Fits 2.5-inch ID coilover springs
• Cone-shaped profile for optimized spring centering and clearance
• Precision-machined construction for exact tolerances
• Durable black anodized finish for superior corrosion and wear resistance
• Essential component for rebuilding or upgrading coilover assemblies

This QA1 1-inch extended length eyelet provides the necessary clearance or additional shock length required for custom suspension setups. Machined from high-strength aluminum and finished with a durable anodized coating, this component replaces a standard shock end to help fine-tune suspension geometry and prevent mounting interference.

Designed for precision and durability, the eyelet features 9/16-18 threads to ensure a secure, high-tolerance fit on compatible shock rods. Each unit comes ready for installation with a high-quality bushing and sleeves already included, allowing you to quickly modify your dampers without sourcing additional hardware.

• Manufacturer: QA1
• Extension: 1 inch
• Thread Size: 9/16-18
• Material: Anodized Aluminum
• Included Hardware: Bushing and Sleeves
• Function: Replaces standard eyelet for increased shock length

QA1 H Series rod ends are engineered for high-load applications where durability and serviceability are critical. This three-piece design features a precision-ground ball and a specialized race housed within a high-strength alloy steel body. Unlike maintenance-free alternatives, the H Series includes an integrated grease zerk, allowing you to flush out contaminants and re-lubricate the bearing to ensure smooth articulation and a long service life in demanding environments.

• Series: H Series (Heavy-Duty 3-Piece)
• Body Material: Alloy Steel
• Bore Diameter: 16mm
• Thread Size: M16x1.5 Right Hand (Female)
• Lubrication: Integrated Zerk fitting for grease service
• Construction: Three-piece design for superior load distribution

This QA1 2-inch extended length eyelet provides additional reach for shock and coilover mounting, helping to prevent binding or reach specific chassis mounting points without replacing the entire shock assembly. Each eyelet is CNC machined from high-quality aluminum with a durable anodized finish for superior corrosion resistance and longevity.

The assembly comes complete with pre-installed bushings and sleeves, ensuring a direct fit and smooth articulation for your suspension system. These are specifically designed for shock absorbers utilizing a 9/16-18 threaded shaft.

• Extension Length: 2 inches
• Thread Pitch: 9/16-18
• Material: CNC machined aluminum
• Finish: Protective anodized coating
• Includes: Pre-installed bushings and sleeves

The QA1 K Series 3-piece rod end is engineered for high-load durability in suspension, steering, and custom mechanical linkages. This male right-hand rod end features a robust carbon steel body designed to handle significant stress while maintaining precise articulation. The integrated grease zerk allows for straightforward periodic maintenance, ensuring the internal components stay lubricated and free of debris for a longer service life in demanding environments.

• Series: K Series
• Construction: 3-Piece
• Type: Male / Right Hand
• Bore Diameter: .75 in
• Thread Size: 3/4-16
• Material: Carbon Steel
• Feature: Integrated grease zerk fitting

Fits 1990-1993 Ford Mustang GT, LX, and SVT Cobra / Cobra R.

The QA1 Level 1 Handling Kit is engineered for Fox Body owners seeking a more aggressive stance and improved damping control. This system replaces the factory suspension with high-performance components designed to lower the center of gravity and provide superior cornering stability. The kit allows for up to 2" of ride height adjustment, giving you the ability to dial in the perfect stance without sacrificing ride quality.

The front suspension is upgraded with inverted cartridge struts featuring large-diameter shafts and lightweight aluminum bodies, which reduce unsprung weight and improve response. Included aluminum caster camber plates provide the precision adjustment needed to optimize suspension geometry. For the rear, single-adjustable coilovers offer tunable damping for both street and track use. The package is rounded out with a front sway bar designed to sharpen steering response and significantly reduce body roll during high-speed cornering.

• Damping Adjustment: Single-adjustable front and rear for street and track tuning
• Front Struts: Inverted cartridge design with lightweight aluminum bodies
• Springs: High-travel springs with optimized rates for handling and comfort
• Ride Height: Up to 2" drop from factory height
• Caster Camber Plates: Precision-machined aluminum for geometry adjustment
• Front Sway Bar: Designed to reduce body roll and plant the tires in corners
• Construction: Fully bolt-in installation with tubular suspension components
• Compatibility Note: Not compatible with Cobra models equipped with IRS
• Manufacturing: Proudly made in Lakeville, Minnesota, USA

Protect your critical suspension components with the QA1 1210-XXX Polyurethane Ball Joint Dust Boot. This small-sized boot serves as a high-durability upgrade over standard rubber seals, designed to provide a tight fit that keeps grease inside the joint where it belongs.

Fabricated from premium polyurethane, this boot is engineered to resist the degrading effects of road salt, oil, and ozone that typically cause factory rubber boots to crack and perish. By maintaining a reliable seal, it prevents abrasive road grit and moisture from entering the ball joint, significantly extending the service life of your steering and suspension system.

• Manufacturer Part Number: 1210-XXX
• Material: High-performance polyurethane
• Size: Small
• Application: Designed to replace worn or torn ball joint boots on various automotive applications
• Durability: Superior resistance to oils, chemicals, and environmental weathering

This QA1 C Series 2-piece rod end is a reliable, economical solution for mechanical linkages, steering components, and suspension pivot points. Designed for durability in static or low-oscillation applications, the carbon steel body provides the structural integrity needed for custom tie rods, shift linkages, or support struts.

The two-piece construction features a left-hand (LH) thread configuration, making it essential for building adjustable assemblies that require length tuning without disassembly. Each rod end comes complete with a matching jam nut to secure your settings and prevent thread movement under load.

• Series: QA1 C Series
• Type: 2-Piece Male Rod End
• Thread Direction: Left Hand (LH)
• Bore Diameter: .5 in (1/2")
• Thread Pitch: 1/2-20
• Material: Carbon Steel
• Hardware Included: Jam Nut

Fits 1982-1992 Chevrolet Camaro and Pontiac Firebird F-Body models (Select engines).

The third-generation GM F-Body platform is susceptible to unibody flex, particularly around the steering box mount. The QA1 Steering Brace, commonly known as the "Wonder Bar," addresses this by tying the front subframes together. This high-strength tubular component bolts directly between the front sway bar and the frame rails, reinforcing a known weak point and distributing steering loads more effectively across the front of the chassis.

Installing the 52122 brace results in sharper steering response and improved cornering stability. The design maintains factory ground clearance and tucks neatly between the sway bar and frame for a low-profile, functional upgrade that protects your chassis from stress-induced fatigue.

• Chassis Rigidity: Strengthens the front subframe area to reduce unibody flex and protect the steering box mount.
• Improved Handling: Delivers more precise steering feedback and predictable cornering.
• Tubular Construction: Lightweight, rigid steel design for maximum structural improvement.
• Bolt-In Installation: Mounts directly to factory points above the front sway bar.
• Origin: Proudly manufactured in Lakeville, Minnesota.
• MPN: 52122

Installation Note: Models from 1982-1984 may require slight slotting of the existing mounting holes for proper alignment.

Fits select 1955-1981 GM vehicles, including Chevrolet Bel Air, Camaro, Chevelle, Pontiac Firebird, GTO, and Buick Skylark.

The QA1 GM Pro Front Coil-Over Shock Absorber (GS501) provides precision-tuned suspension control for classic GM vehicles. Featuring a single-adjustable knob, this shock allows you to adjust compression and rebound simultaneously, making it easy to dial in your suspension for specific driving styles or track conditions. Constructed from lightweight billet aluminum, it utilizes a bolt-in design that installs directly to factory stock mounting points while providing the added benefit of adjustable ride height.

• MPN: GS501
• Adjustment Type: Single adjustable (simultaneous compression and rebound)
• Material: Lightweight billet aluminum
• Dimensions: 10.125-inch compressed / 15-inch extended length
• Mounting: Stock mount compatible for easy bolt-in installation
• Quality Standards: 100% dyno tested and serialized
• Sustainability: Fully serviceable and rebuildable by QA1 authorized service centers
• Origin: Made in the USA

The QA1 Proma Star Series Double Adjustable Coil-Over Shock (MPN: DD401) provides high-performance damping and independent tuning for custom chassis and suspension applications. Designed for drivers who demand precision, this shock features two adjustment knobs to control rebound and compression separately, making it equally effective on the street, drag strip, or road course.

Constructed with a lightweight aluminum body and 100% dyno-tested for quality, the DD401 is built for durability and consistency. The bearing mount configuration minimizes deflection and is ideal for mounts requiring misalignment. When paired with a standard 2.5-inch ID coil spring (sold separately), this shock allows for quick and easy ride height adjustments to achieve the perfect stance and corner balance.

• Valving: Double-adjustable independent compression and rebound tuning.
• Mounting: Bearing mount design reduces deflection and supports misalignment.
• Dimensions: 10.125-inch compressed length and 14-inch extended length.
• Construction: Lightweight aluminum body with integrated adjustment knobs.
• Ride Height: Fully adjustable spring seat for easy height tuning.
• Compatibility: Requires a 2.5-inch inner diameter (ID) coil spring.
• Warranty: Eligible for a Limited Lifetime Warranty (requires registration).
• Origin: Proudly made in the USA.
• Manufacturer Part Number: DD401

Fits 1974-1978 Ford Mustang II including Base, Ghia, Mach 1, and 2+2 models.

The QA1 MS303 Pro Front Coil-Over Shock is engineered to provide precise control and improved ride quality for 1974-1978 Ford Mustang II applications. Featuring single-adjustable valving, this shock allows you to adjust compression and rebound simultaneously, making it an ideal solution for street performance and occasional drag strip use. The lightweight billet aluminum body is threaded for easy ride height adjustment, allowing you to dial in the perfect stance for your vehicle.

Every QA1 aluminum shock is 100% dyno tested and serialized at their Minnesota facility to ensure consistent damping performance across all units. Designed for a straightforward bolt-in installation, these shocks are also fully serviceable and rebuildable to ensure long-term durability and performance.

• Manufacturer Part Number: MS303
• Adjustment Type: Single Adjustable (Simultaneous Compression and Rebound)
• Material: Lightweight Billet Aluminum
• Bushing Size: 7/16in
• Compressed Length: 7.88in
• Extended Length: 11in
• Construction: 100% Dyno Tested and Serialized
• Serviceability: Serviceable and Rebuildable by QA1 Authorized Centers
• Origin: Made in the USA

Fits 1994-1996 Buick Roadmaster, Chevrolet Caprice, and Chevrolet Impala SS.

Improve the cornering performance and stance of your GM B-Body with the QA1 Level 1 Handling Kit 2.0. This entry-level performance suspension system is engineered specifically for street use, providing a significant upgrade over aged factory components without compromising ride quality. Designed as a direct bolt-in solution, these components mount to factory locations for a straightforward installation that can be completed in stages as your build progresses.

The kit features carefully selected spring rates optimized for average-weight small block and LS-swapped B-Bodies in stock trim. By replacing heavy, stamped-steel factory arms with strong, lightweight tubular components, you reduce unsprung weight and improve suspension geometry for better turn-in and high-speed stability. The included shock absorbers are valved to provide a smooth, controlled ride while maintaining consistent performance under load.

• Manufacturer Part Number: HK21-GMB5
• Application: 1994-1996 GM B-Body platform
• Kit Level: Level 1 Handling Kit 2.0
• Direct bolt-in installation with no cutting or welding required
• Compatible with original equipment mounting points
• Includes performance-tuned shocks and tubular suspension components
• Spring rates optimized for small block and LS engine configurations
• Proudly made in the USA

Fits 1967-1969 Chevrolet Camaro and Pontiac Firebird models (V8 Small Block and LS-Series).

Upgrade your first-generation GM F-Body with the QA1 Level 1 Handling Kit, a performance-oriented suspension solution designed for bolt-in installation. This kit is specifically engineered to replace worn OE components with high-strength tubular parts and adjustable valving, providing significantly better handling and straight-line stability without sacrificing street comfort.

At the core of this kit are single-adjustable shocks that allow you to fine-tune your rebound settings to match your specific driving preferences. The spring rates have been carefully selected for average-weight small block and LS-powered vehicles, ensuring a smooth ride while eliminating the float and body roll typical of factory 1960s suspension. Because the components are designed to work with factory mounting points, you can install the full kit at once or build your suspension in stages as your performance needs evolve.

• Single-adjustable valving for precise shock tuning and ride height adjustment
• Strong, lightweight tubular components for improved chassis response
• Spring rates optimized for small block and LS-swapped F-Body applications
• Direct bolt-in installation with no fabrication required
• Modular design compatible with other QA1 suspension upgrades
• Proudly made in the USA
• Manufacturer Part Number: HK21-GMF1

Fits 1977-1990 GM B-Body vehicles.

The QA1 Level 2 Big Wheel Kit (BW02-GMB5) is a comprehensive suspension solution engineered specifically for high-risers and cars running oversized wheels. This kit solves the common fitment issues associated with large diameter wheels by providing the adjustability needed to center the wheels within the wheel wells and fine-tune the stance for optimal clearance and aesthetics.

• Adjustable Ride Height: Integrated height adjustment allows you to dial in the perfect look and ensure proper fender clearance for your specific wheel and tire combination.
• On-the-Car Shock Adjustments: Features adjustable shocks at all four corners, allowing you to tune damping rates without removing the components from the vehicle.
• Tubular Control Arms: Replaces factory stamped-steel arms with high-strength tubular units for improved suspension geometry and durability.
• Adjustable Trailing Arms: Essential for big wheel applications, these arms allow you to precisely center the rear wheels in the wheel arch to prevent rubbing and improve handling.
• Direct Bolt-In Installation: Designed to mount to factory locations for a straightforward upgrade process.
• Made in the USA: Manufactured with precision and backed by QA1's industry-leading standards.
• Manufacturer Part Number: BW02-GMB5

The QA1 9HT180 High Travel Spring is engineered to optimize suspension performance by reducing unsprung weight and maximizing usable travel. Manufactured in the USA from high-tensile chrome silicon alloy spring wire, this 2.5-inch ID spring features a specialized design with fewer coils and a smaller wire diameter compared to standard springs. This construction allows the suspension to react faster and provides a larger distance between coils to prevent premature coil-bind.

• Part Number: 9HT180
• Inner Diameter: 2-1/2"
• Length: 9"
• Spring Rate: 180 lbs/in
• Material: High-tensile chrome silicon steel
• Manufacturing: Cold-wound, heat-treated, and shot-peened for fatigue resistance
• Finish: Durable silver powder coat

Each spring is precision-ground at both ends to ensure square, consistent seating and accurate operation. The high-grade alloy allows these springs to be compressed to coil-bind without affecting the free height or spring rate. QA1 stands behind their manufacturing with a lifetime guarantee that the spring will remain within 2% of its original free height and rate under normal operating conditions.

Fits select 1978-1996 Buick Roadmaster and LeSabre, Chevrolet Caprice and Impala SS, Oldsmobile Delta 88 and Custom Cruiser, and Pontiac Bonneville and Parisienne.

Engineered to significantly reduce body roll and improve cornering stability, the QA1 Front Sway Bar is a high-performance upgrade for the GM B-Body platform. This 1-3/8 inch bar is manufactured from lightweight 4130 Chromoly steel with a hollow-core design, providing the stiffness needed for flat handling without the excessive weight of a solid bar. Each unit is CNC-formed to ensure a precise fit and a straightforward bolt-on installation using existing mounting points.

To ensure long-term performance and durability, the bar features a gloss black powder-coated finish for corrosion resistance. The kit includes greasable graphite polyurethane bushings that eliminate the deflection found in factory rubber, along with high-quality plated hardware for a complete installation.

• Material: 4130 Chromoly steel
• Diameter: 1-3/8 inch (1.375")
• Construction: CNC-formed hollow-core design
• Finish: Gloss black powder coat
• Bushings: Greasable graphite polyurethane
• Hardware: Plated mounting hardware included
• Manufacturer Part Number: 52862
• Origin: Made in the USA

Upgrade the ride quality and handling of your C2 or C3 Corvette with the QA1 Stocker Star Series TN403 rear shock absorber. Fits 1963-1982 Chevrolet Corvette models. This lightweight aluminum shock is designed as a direct-fit performance upgrade that bolts into factory mounting points without the need for cutting or welding. Unlike sealed units, these smooth-body shocks are fully rebuildable and revalveable, ensuring a long service life and the ability to tune for specific driving conditions.

• Lightweight aluminum construction for reduced unsprung weight
• Non-adjustable valving optimized for street and performance use
• Compressed length: 10.625 inches / Extended length: 14.5 inches
• 100% dyno-tested and serialized for quality assurance
• Direct stock mount installation for easy bolt-in setup
• Manufacturer Part Number: TN403
• Proudly made in the USA

Fits select 1979-2004 Ford Mustang models, excluding those equipped with Independent Rear Suspension (IRS). This QA1 Pro-Coil rear coilover conversion kit transforms your Mustang's handling and stance by replacing the factory shock and spring setup with a high-performance, height-adjustable system.

Engineered for street performance and weekend track use, these single-adjustable shocks feature 18-way simultaneous compression and rebound valving. A single integrated knob allows you to quickly dial in the damping for a comfortable street ride or firm track response. The fully threaded, lightweight aluminum shock bodies provide up to 2 inches of ride height lowering from the stock position, allowing you to optimize your vehicle's center of gravity.

This kit is designed for a straightforward bolt-in installation using specially engineered mounting brackets and requires no major fabrication. Each kit comes complete with aluminum shocks, high-quality springs, and all necessary mounting hardware.

• Manufacturer Part Number: RCK52402
• Damping Adjustment: 18-way single-adjustable
• Spring Rate: 130 lb/in (12-inch length)
• Material: Machined aluminum threaded shock bodies
• Ride Height Range: Stock to 2" lowering
• Installation: Direct bolt-in conversion
• Origin: Made in Lakeville, Minnesota, USA
• Warranty: Limited lifetime warranty (registration required via QA1)

Note: This kit is not compatible with SVT Cobra models equipped with factory Independent Rear Suspension (IRS).

Fits select 2021-2026 Ford F-150 models including XL, XLT, Lariat, King Ranch, Platinum, and Raptor. This QA1 lowering kit (LK01-FF03) provides a comprehensive suspension solution, combining front Pro Coil coil-overs with a rear drop kit to achieve a custom stance while significantly enhancing ride quality and handling performance.

The front suspension features heavy-duty Pro Coil coil-over shocks with fully threaded bodies, allowing for precise height adjustments without shims or spacers. For the rear, the kit includes heavy-gauge steel flip brackets, shackles, and hangers finished in a durable powder coat to lower the center of gravity without compromising chassis integrity. Single-adjustable valving allows you to simultaneously tune compression and rebound with a simple knob adjustment to suit your driving preference.

• Manufacturer Part Number: LK01-FF03
• Front Drop Range: 1" to 3" (Stock Spindles) or 3" to 5" (Drop Spindles)
• Rear Drop Range: 3.5" to 5.5" on 2WD trucks; 4WD trucks see an additional 1.5" drop
• Adjustment: Single-adjustable shock valving for simultaneous compression/rebound tuning
• Construction: Heavy-duty threaded shock bodies and powder-coated steel rear components
• Fitment Note: Not compatible with Power Boost models or Continuously Controlled Damping (CCD) suspension
• Installation: Easy, bolt-in design with high-grade hardware included
• Warranty: Lifetime shock warranty (requires registration at QA1.net/warranty)
• Country of Origin: Made in the USA

Upgrade your vehicle's cornering capabilities and ride quality with the QA1 Level 2 Handling Kit 2.0. Engineered for 1968-1972 GM A-Body platforms, this comprehensive suspension system replaces worn factory components with high-strength tubular geometry and precision-tuned shocks. This Level 2 kit is specifically geared toward small block and LS-powered vehicles, providing a balanced spring rate that maximizes handling performance without sacrificing a smooth, comfortable street ride.

The HK22-GMA2 kit is designed as a direct bolt-in solution, mounting to factory locations for a seamless installation. By utilizing lightweight tubular components, this kit reduces unsprung weight while increasing chassis rigidity. Whether you are restoring a classic Chevelle or building a pro-touring GTO, these components provide the straight-line stability and consistent performance needed for modern driving conditions.

• Direct-fit for 1968-1972 GM A-Body vehicles including Chevelle, GTO, Cutlass, and Skylark
• Includes performance-tuned shocks for ultimate ride height and damping control
• High-strength, lightweight tubular components improve suspension geometry
• Spring rates optimized for average-weight small block and LS engine configurations
• Complete bolt-in installation using factory mounting points
• Made in the USA
• Manufacturer Part Number: HK22-GMA2

Fits select 1982-2004 Chevrolet S10 and GMC S15/Sonoma pickup models. This QA1 Stocker Star Series rear shock absorber (MPN: TD804) provides the ultimate in suspension tuning for the rear of your S-Series truck. Featuring a lightweight billet aluminum smooth body, these shocks are designed for owners who demand precise control over their vehicle's handling and ride quality.

The double-adjustable valving system provides independent 18-way adjustment for both compression and rebound, allowing for 324 possible valving combinations. This enables you to dial in specific settings for street cruising, drag racing, or heavy hauling without removing the shock from the vehicle. Every QA1 shock is 100% dyno tested and serialized to ensure consistent performance. Built in the USA, these units feature a bolt-in design that utilizes factory mounting points for a straightforward installation.

• Independent Adjustment: 18-way compression and 18-way rebound knobs for precision tuning.
• Construction: Lightweight, high-strength billet aluminum body.
• Dimensions: 13.625-inch collapsed length; 21.125-inch extended length.
• Serviceable: Fully rebuildable and serviceable by QA1 authorized centers.
• Installation: Direct bolt-in replacement for OE shocks; works with factory suspension.
• Warranty: Manufacturer limited lifetime warranty.

Fits select 1999-2006 Chevrolet Silverado 1500 and GMC Sierra 1500.

The QA1 Pro Coil System provides a direct bolt-in solution for owners seeking superior valving control and a customizable stance. This single-adjustable system allows you to tune both compression and rebound valving simultaneously with a single knob, making it easy to find the ideal balance for street performance or drag racing. The lightweight billet aluminum shock body features a fully threaded exterior, enabling up to 2 inches of ride height adjustment for fine-tuning weight distribution and vehicle aesthetics.

This kit includes QA1’s American-made high-travel springs. These 750 lbs/in springs are engineered with a specialized wire diameter and fewer coils than standard springs, reducing unsprung weight and providing more travel. This results in a faster-reacting suspension that optimizes traction and ride quality. The system is designed to work seamlessly with factory control arms or upgraded QA1 tubular units.

• MPN: GS517-10750C
• Adjustment Type: Single Adjustable (Simultaneous Compression and Rebound)
• Shock Material: Lightweight Billet Aluminum
• Spring Rate: 750 lbs/in
• Spring Length: 10 inches
• Ride Height: Adjustable up to 2 inches
• Testing: 100% Dyno Tested and Serialized
• Build: Serviceable and Rebuildable by QA1 Authorized Centers
• Manufacturing: Made in the USA
• Included: Sold in Pairs

Fits select 1964-1972 Buick Skylark and Special, Chevrolet Chevelle, El Camino, and Monte Carlo, Oldsmobile 442, Cutlass, F85, and Vista Cruiser, and Pontiac Grand Prix and GTO.

QA1 Pro-Touring Upper Control Arms are engineered to correct the outdated front-end geometry of classic GM A-Body vehicles, making them an essential upgrade for autocross, road course, and performance street applications. These arms are designed to add 3 to 4 degrees of caster and 0.5 to 1 degree of negative camber when installed as a complete kit, significantly improving cornering grip and straight-line stability.

Constructed from high-strength tubing with billet aluminum cross shafts, these arms offer an optimized strength-to-weight ratio. They feature QA1’s patented Ultra Low Friction Ball Joints with a one-inch longer stud. This extended length improves camber gain during suspension travel, keeping the tire contact patch flat against the pavement for superior traction. The ball joints are fully adjustable and rebuildable, allowing for fine-tuning with different stud lengths if needed. These arms are specifically configured for use with QA1 Pro Coil Systems featuring double shear lower mounting.

• Manufacturer Part Number: 52522
• Includes QA1 patented Ultimate Low Friction Ball Joints
• 1-inch longer ball joint studs for optimized camber gain
• Adds 3-4° caster and 0.5-1° negative camber
• Billet aluminum cross shafts and robotically welded tubular steel construction
• Low-friction bushings eliminate bind for smoother suspension articulation
• Durable high-quality powder-coated finish
• Easy bolt-in installation to factory mounting points
• Made in the USA

Designed for custom chassis builds and vehicles without direct-fit shock options, the QA1 Proma Star Series coil-over shock absorber delivers professional-grade tuning for the street, drag strip, and road course. This double-adjustable unit allows you to independently dial in compression and rebound settings via two external knobs, providing 324 possible valving combinations to precisely control weight transfer and ride quality.

• Independent Tuning: Double-adjustable valving allows separate control over compression and rebound for maximum handling performance.
• Aluminum Construction: Lightweight, high-strength aluminum body is dyno-tested to ensure consistent damping across all temperature ranges.
• Ride Height Adjustable: The threaded body and included hardware kit facilitate easy ride height adjustments to achieve the ideal stance; requires a 2.5-inch ID spring.
• NVH Reduction: Polyurethane bushing mounts include 1/2-inch and 5/8-inch sleeves to reduce noise, vibration, and harshness while maintaining durability.
• Quality Assurance: Proudly made in the USA and backed by a limited lifetime warranty (requires registration).

Specifications:
Manufacturer Part Number: DD402
Compressed Length: 10.125 in.
Extended Length: 14.0 in.
Stroke: 3.875 in.
Mounting: Poly Bushing (1/2" and 5/8" sleeves included)

Fits 1974-1978 Ford Mustang II including 2+2, Base, Ghia, and Mach 1 models.

The QA1 Mustang II Pro Front Coil-Over System is engineered to transform the handling and stance of your vehicle for both street and strip applications. This single-adjustable kit features simultaneous compression and rebound tuning through a single knob, allowing for precise damping control. The lightweight billet aluminum shock bodies are fully threaded, providing the flexibility to adjust ride height for a lower stance and finely tuned weight balance.

Built for durability and performance, these shocks are 100% dyno tested and serialized before leaving the factory. The system includes specially designed chrome-plated springs and all necessary mounting hardware for a straightforward bolt-in installation. Being fully rebuildable and revalveable, this system offers a long-term suspension solution for classic Ford enthusiasts.

• Single-adjustable valving for easy damping adjustment
• 8-inch springs with a 500 lbs/in spring rate
• 7/16-inch mounting bushings included
• Lightweight billet aluminum threaded bodies
• Ride height adjustable for a custom stance
• Direct bolt-in installation; no welding required
• 100% dyno tested and serialized
• Made in the USA
• Manufacturer Part Number: MS303-08500

Fits 1967-1969 Chevrolet Camaro and Pontiac Firebird (Base, RS, SS, Z28, 326, 350, 400, Sprint, and Trans Am).

The QA1 HK42-GMF1 Level 2 Handling Kit is a comprehensive suspension overhaul designed for F-Body owners seeking improved cornering grip and ride quality for twisty backroads and weekend track events. This system replaces the factory front and rear suspension with high-performance tubular components and double-adjustable damping.

The front suspension features lightweight tubular control arms equipped with composite bushings for bind-free movement and low-friction ball joints. The upper ball joints feature +1-inch longer studs to improve camber gain and overall front-end grip. For the rear, the tubular 4-link system is optimized for clearance, supporting both standard and mini-tubs for wider wheel and tire combinations.

• Manufacturer Part Number: HK42-GMF1
• Front Ride Height: 0" to -2" of adjustability
• Rear Ride Height: +2" to -3" of adjustability
• Shock Type: Double adjustable with independent rebound and compression tuning
• Front Suspension: Lightweight tubular control arms with composite bushings
• Rear Suspension: Tubular 4-link (requires minimal welding; no floor pan modification)
• Installation: Bolt-in front suspension; welding required for rear 4-link
• Compatibility: Compatible with mini-tubs for maximum tire width
• Origin: Made in the USA

Kit includes spanner wrench for height adjustments. QA1 subframe connectors are recommended for maximum chassis rigidity.

Fits select 1964-1972 Chevrolet Chevelle, Monte Carlo, and Pontiac Grand Prix models. This QA1 Pro Rear Coil-Over System provides a comprehensive suspension upgrade for GM A-Body and G-Body vehicles, allowing you to fine-tune both stance and damping characteristics with a direct bolt-in installation.

Constructed from lightweight billet aluminum, these single-adjustable shocks feature 18 positions of simultaneous rebound and compression adjustment. This allows you to dial in the ultimate balance of ride quality and performance handling for street performance, drag racing, or autocross. The fully threaded shock bodies provide significant ride height flexibility, ranging from 0.5 inches higher than stock down to 2.25 inches lower than stock.

• Single adjustable valving with 18 simultaneous compression and rebound settings
• 12-inch springs with a 200 lbs/in spring rate
• Lightweight billet aluminum construction manufactured in the USA
• 100% dyno tested and serialized for quality assurance
• Fully rebuildable and serviceable by authorized QA1 centers
• Direct bolt-in installation to factory mounting points
• Manufacturer Part Number: RCK52359
• Sold as a pair

Fits select 1978-1988 GM G-Body vehicles including Buick Regal, Chevrolet El Camino, Malibu, Monte Carlo, GMC Caballero, and Pontiac Bonneville and Grand Prix.

The QA1 Level 2 Handling Kit (HK22-GMG1) is designed to transform the suspension geometry and responsiveness of your G-Body platform. This kit provides a significant upgrade in cornering performance and straight-line stability while maintaining the comfort required for street driving. It features carefully selected spring rates optimized for average-weight small block (SBC) and LS-powered vehicles in stock trim.

Built with strong, lightweight tubular components, this kit serves as a direct bolt-in replacement for factory parts, mounting seamlessly to OE locations. The included shocks offer precise tunability for both ride height and damping, allowing you to dial in the perfect stance and handling characteristics for your specific driving style.

• Direct Bolt-In: Installs into factory mounting points without the need for permanent modifications.
• Tubular Components: Strong, lightweight construction improves suspension geometry and reduces unsprung weight.
• Optimized Spring Rates: Tuned specifically for SBC and LS engine configurations to balance performance and comfort.
• Complete Tunability: Includes shocks designed for ride height adjustment and valving control.
• Modular Compatibility: Works with original OE components or can be used as a foundation for further suspension stages.
• American Made: Manufactured in the USA and backed by a best-in-class warranty.
• Manufacturer Part Number: HK22-GMG1