The QA1 JNR8S steel jam nut is engineered for securing rod ends and linkage adjustments in both automotive suspension and industrial applications. This high carbon steel nut provides the necessary locking force to prevent hardware from backing off under vibration or load. Each nut features a protective coating for corrosion resistance and is manufactured to meet ANSI B18.2.2-1972 standards for dimensional accuracy and reliability.

• Part Number: JNR8S
• Thread Size: 1/2-20
• Thread Direction: Right Hand (RH)
• Material: High Carbon Steel
• Hex Size: 3/4"
• Thickness: 5/16"
• Standards: Referenced to ANSI B18.2.2-1972
• Finish: Protective clear coating

Designed for secure linkage and rod end adjustment, this QA1 steel jam nut provides a low-profile locking solution for industrial and automotive applications. Each nut is manufactured from high carbon steel, offering the structural integrity required for high-stress environments.

Built to satisfy ANSI B18.2.2-1972 specifications, these nuts feature a protective coating for improved corrosion resistance and consistent performance. The thin 7/32-inch width allows for installation in constrained spaces where standard-height nuts would interfere with articulation or assembly.

• Manufacturer Part Number: JNR6S
• Thread Size: 3/8-24 Right Hand (RH)
• Material: High Carbon Steel
• Hex Size: 9/16"
• Nut Width: 7/32"
• Standards: ANSI B18.2.2-1972

The QA1 JNR3S is a precision-engineered jam nut designed for industrial and automotive applications where secure fastening and reliable thread locking are required. Manufactured from high carbon steel, this nut is built to withstand the stresses of high-performance linkages and suspension components while maintaining consistent torque.

• Thread Pitch: 10-32 Right Hand
• Hex Size: 3/8 inch
• Width: 1/8 inch
• Material: High Carbon Steel with protective coating
• Standard: References ANSI B18.2.2-1972
• Manufacturer Part Number: JNR3S

Ideal for use with rod ends and spherical bearings, this thin-profile jam nut provides a secondary locking mechanism to prevent loosening under vibration. Its high carbon steel construction ensures greater tensile strength and fatigue resistance compared to standard low-carbon hardware.

Secure your rod ends, linkages, and suspension components with this QA1 high carbon steel jam nut. Engineered for durability and precision, this 5/8-18 right-hand thread nut is built to the ANSI B18.2.2-1972 standard, ensuring a reliable fit and consistent performance in both automotive and industrial applications.

• Manufactured from high carbon steel for superior strength and fatigue resistance
• Protective coating provides corrosion resistance for long-term durability
• Precision machined 15/16 inch hex drive for secure tightening and adjustments
• 3/8 inch width allows for low-profile installation in tight clearances
• Compatible with any 5/8-18 right-hand male threaded component
• Manufacturer Part Number: JNR10S

The QA1 JNL8S Steel Jam Nut is engineered for securing rod ends, suspension linkages, and industrial components. Constructed from high carbon steel, this jam nut provides the structural integrity required for high-load applications. It is finished with a protective coating to resist corrosion and ensure long-term durability in demanding environments.

This hardware follows the ANSI B18.2.2-1972 standard, ensuring precise tolerances for fitment and torque retention. As a left-hand threaded component, it is essential for adjustable turnbuckles and linkages where counter-rotating threads are used to set alignment or length.

• Part Number: JNL8S
• Thread Size: 1/2-20 LH (Left Hand)
• Hex Size: 3/4 inch
• Width: 5/16 inch
• Material: High Carbon Steel
• Standard: ANSI B18.2.2-1972
• Finish: Clear protective coating

Secure your rod ends and suspension linkages with this QA1 high-carbon steel jam nut. Engineered for industrial and automotive applications where reliable locking is critical, this jam nut provides the necessary tension to prevent components from backing off under vibration or load.

• Manufacturer Part Number: JNL6S
• Material: High-carbon steel for superior strength and thread durability
• Thread Size: 3/8-24 with a Left Hand (LH) orientation
• Dimensions: 9/16-inch hex width across flats and 7/32-inch total width
• Compliance: Manufactured to reference ANSI B18.2.2-1972 standards
• Finish: Protective coating for enhanced corrosion resistance

Whether you are building custom steering linkages or setting up a multi-link suspension, these steel jam nuts offer the precision and material integrity required for high-stress environments.

This QA1 steel jam nut is engineered for secure locking in rod end assemblies and mechanical linkages. Designed for applications requiring a low-profile footprint, this nut provides the necessary counter-tension to maintain alignment and prevent loosening under vibration. It is manufactured from high carbon steel for superior strength and features a protective coating to ensure long-term durability and corrosion resistance.

• Thread Size: 10-32
• Thread Direction: Left Hand (LH)
• Hex Size: 3/8 inch
• Width/Thickness: 1/8 inch
• Material: High Carbon Steel
• Standard: Reference ANSI B18.2.2-1972
• Manufacturer Part Number: JNL3S

Secure your suspension linkages and rod ends with the QA1 JNL12S steel jam nut. Specifically designed to lock 3/4-16 left-hand threaded components, this nut is engineered from high carbon steel to withstand the stresses of high-load automotive and industrial applications. Each nut is manufactured to meet ANSI B18.2.2-1972 standards, ensuring precise thread engagement and reliable performance.

• Thread Pitch: 3/4-16 LH (Left Hand)
• Material: High carbon steel
• Width Across Flats: 1-1/8 inch hex
• Thickness: 7/16 inch
• Standards: ANSI B18.2.2-1972 compliant
• Finish: Protective coating for corrosion resistance
• Part Number: JNL12S

Fits 1994-2004 Ford Mustang (Base, GT, Bullitt, GTS, Mach 1, SVT Cobra, and Cobra R).

The QA1 Proma Star coilover strut kit (MPN: HS03-12200) provides a complete suspension upgrade for SN95 Mustang owners looking to bridge the gap between street comfort and track performance. This kit utilizes an inverted strut design, which significantly increases resistance to side-loading compared to traditional layouts, ensuring better geometry under heavy cornering loads. The single-adjustable valving allows you to simultaneously tune rebound and compression to match your specific driving requirements.

• Single-adjustable valving for precise damping control
• Inverted strut design for increased strength and side-load resistance
• Fully adjustable ride height for a custom stance and center of gravity
• Includes lightweight caster camber plates for alignment precision
• Tuned spring rates optimized for performance and ride quality
• Made in the USA with a direct bolt-in installation to factory mounting points

Kit Includes: One pair of struts, coilover springs, caster camber plates, and all necessary installation hardware.

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

The QA1 Proma Star coilover strut kit is a comprehensive suspension solution designed for Fox Body Mustang owners who demand precision tuning for both street and track environments. This kit features an inverted strut design that significantly increases stiffness and resists side loading, maintaining geometry under high cornering forces. The single-adjustable valving allows you to simultaneous adjust compression and rebound with a single knob, making it easy to dial in your suspension for specific track conditions or ride quality preferences.

Each kit includes lightweight aluminum caster camber plates to provide the adjustment range necessary for proper alignment on lowered vehicles. The system allows for precise ride height adjustability, helping you achieve the perfect stance and center of gravity. Designed as a direct bolt-in replacement, this kit requires no permanent modifications to your factory shock towers.

• Single-adjustable valving for simultaneous compression and rebound control
• Inverted strut design for superior strength and side-load resistance
• Lightweight caster camber plates included for improved alignment geometry
• Ride height adjustable to customize vehicle stance
• Easy bolt-in installation to factory mounting points
• Manufacturer Part Number: HS02-12200
• Made in the USA

What's Included: One pair of single-adjustable struts, coilover springs, caster camber plates, and all necessary mounting hardware.

The QA1 HMR10T HM Series rod end is a high-performance, three-piece male rod end engineered for precision and durability in demanding motorsport and suspension applications. Constructed from heat-treated chromoly steel, this rod end provides the high-load capacity and tight tolerances required for steering linkages, control arms, and custom chassis work.

The HMR10T features a three-piece design with a PTFE liner for smooth, maintenance-free operation and reduced friction. The ball is manufactured from 52100 bearing steel that has been heat treated, hard chrome plated, and precision ground. Both the body and race are crafted from heat-treated chromoly steel with protective coatings to ensure maximum resistance to corrosion and wear under harsh track or street conditions.

• Manufacturer Part Number: HMR10T
• Thread Size: 5/8-18 Right Hand Male
• Bore Diameter: 0.625 inch (5/8")
• Construction: 3-Piece HM Series
• Ball Material: 52100 Bearing Steel (Heat Treated, Hard Chrome Plated, Precision Ground)
• Body Material: Chromoly Steel (Heat Treated, Protective Coated)
• Race Material: Chromoly Steel (Heat Treated, Protective Coated)
• Liner: PTFE self-lubricating liner

The QA1 HM Series HML10T rod end is a high-performance, three-piece chromoly steel component engineered for demanding motorsport applications. This male, left-hand thread rod end features a heat-treated body and an integrated PTFE liner, offering a combination of high load capacity and low-friction operation without the need for manual lubrication.

• Part Number: HML10T
• Thread: 5/8-18 Male Left Hand (LH)
• Bore Size: 0.625" (5/8")
• Ball: 52100 bearing steel, heat treated, hard chrome plated, and precision ground
• Race: Heat-treated chromoly steel with corrosion and wear-resistant properties
• Body: Heat-treated chromoly steel with a protective coating for long-term durability
• Liner: Self-lubricating PTFE for smooth pivot action

Built to precise tolerances, these precision rod ends are ideal for suspension linkages and steering components where strength and fatigue resistance are critical.

Fits 1988-1998 Chevrolet C1500 models including 454 SS, Base, Cheyenne, Scottsdale, Silverado, and WT.

The QA1 Level 3 Handling Kit (MPN: HK03-OBS1) is engineered for OBS Chevrolet owners who demand competition-grade performance without sacrificing the ability to drive to the track in comfort. This comprehensive suspension system replaces factory components with lightweight, high-strength tubular hardware and fully adjustable damping to maximize cornering grip and chassis stability.

This kit features complete front and rear coil-over conversion systems. When used with drop spindles, the front system allows for up to a 6-inch drop, while the rear provides a 4-inch to 7-inch drop range. To further refine body roll and lateral transitions, the kit includes both front and rear tubular sway bars. Every component is designed to work as a cohesive system, offering ultimate ride height and shock tunability for consistent performance on the street or the autocross course.

• Complete front and rear coil-over conversion for precise ride height and damping control
• Up to 6-inch front drop (with drop spindles) and 4-7 inch rear drop
• Heavy-duty tubular front and rear sway bars included
• Strong, lightweight tubular components for reduced unsprung weight
• Manufacturer Part Number: HK03-OBS1
• Made in the USA

Fits 1988-1998 Chevrolet C1500 models, including 454 SS, Base, Cheyenne, Scottsdale, Silverado, and WT.

The QA1 Level 2 Handling Kit is engineered to transform the suspension of your OBS Chevrolet C1500, delivering significantly improved street performance and a modern ride profile. This kit replaces the factory setup with fully adjustable front and rear coil-over conversion systems, allowing you to fine-tune both ride height and shock valving for the perfect balance of comfort and handling.

This Level 2 system provides up to a 4-inch front drop when paired with drop spindles and an adjustable 4-inch to 7-inch rear drop. Built with strong, lightweight tubular components, this kit also includes a front tubular sway bar to reduce body roll and improve cornering stability without sacrificing ride quality.

• Full front and rear coil-over conversion systems for maximum shock and height tunability
• Front drop capability up to 4 inches (requires drop spindles)
• Adjustable rear drop from 4 inches to 7 inches
• Strong, lightweight tubular components for increased stiffness and weight savings
• Includes high-performance front tubular sway bar
• Bolt-on installation for consistent performance and straight-line stability
• Made in the USA
• Manufacturer Part Number: HK02-OBS1

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

The QA1 Proma Star coilover strut kit is engineered to provide precise suspension tuning for both street and track applications. This kit features a lightweight inverted strut design that significantly resists side loading while reducing unsprung weight for improved response. With double-adjustable valving, you can independently dial in compression and rebound settings to match your specific performance or ride quality needs.

This kit allows for adjustable ride height, helping you achieve the perfect stance and center of gravity. It comes complete with 200lb/in tuned springs and lightweight caster camber plates to provide a comprehensive front suspension solution that bolts directly into the factory mounting points.

• Double-adjustable valving for independent compression and rebound control
• Inverted strut design for increased strength and reduced side load
• Lightweight caster camber plates included for precise alignment
• Tuned 200 lb/in spring rate
• Bolt-in installation using factory spindles
• Made in the USA
• Manufacturer Part Number: HD02-12200

Kit Includes: One pair of double-adjustable struts, coilover springs, caster camber plates, and all necessary installation hardware.

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

Fits 1963-1982 Chevrolet Corvette models including Base, Stingray, Collector's Edition, and Silver Anniversary Edition. This QA1 GM Pro Coil System replaces your factory front shocks and springs with a performance-oriented coil-over conversion designed for superior handling and a custom stance.

Constructed with lightweight billet aluminum bodies, these shocks feature a fully threaded exterior that allows for up to 2 inches of ride height adjustment, letting you dial in your center of gravity and weight balance. The single-adjustable valving design uses one knob to simultaneously adjust compression and rebound settings, simplifying the process of tuning your suspension for street performance or track use. The included 9-inch high-travel springs utilize a specialized wire diameter and fewer coils to reduce unsprung weight and prevent coil bind.

• Manufacturer Part Number: GS507-09450D
• Valving: Single Adjustable (Simultaneous Compression and Rebound)
• Spring Rate: 450 lbs/in
• Spring Length: 9 inches
• Mounting: Pigtail Large
• Shock Material: Billet Aluminum
• Height Adjustment: Up to 2 inches
• Installation: Easy bolt-in; compatible with factory or QA1 tubular control arms
• Quality: 100% Dyno tested and serialized; rebuildable by QA1 service centers
• Origin: Made in the USA
• Warranty: Limited Lifetime Warranty

Each kit is sold in pairs and includes all necessary hardware for a straightforward installation.

Fits 1993-2002 Chevrolet Camaro and Pontiac Firebird (V6/V8).

The QA1 Pro Coil System provides a complete front suspension solution for GM 4th Generation F-Body platforms, allowing for precision-tuned ride height and damping control. This kit features single-adjustable billet aluminum shocks, which utilize a simultaneous compression and rebound adjustment mechanism to dial in your suspension for street performance or track days. The fully threaded shock bodies enable fine-tuned stance adjustments and precise corner weighting.

This system includes American-made, lightweight high-travel springs. These 15-inch, 300lb/in springs are designed with fewer coils and a smaller wire diameter than standard springs, reducing unsprung weight and providing increased travel to prevent coil bind. Every shock is 100% dyno tested and serialized to ensure consistent performance out of the box.

• Manufacturer Part Number: GS502-15300
• Single Adjustable: Simultaneous compression and rebound valving
• Material: Lightweight billet aluminum shock bodies
• Spring Rate: 300 lbs/in
• Spring Length: 15 inches
• Installation: Easy bolt-in design with no welding required
• Serviceable and rebuildable by QA1 authorized centers
• Includes: (2) Front coil-over shocks and (2) High-travel springs
• Made in the USA

Fits select 1993-2002 Chevrolet Camaro and Pontiac Firebird models (4th Gen F-Body).

The QA1 GM Pro Front Coil-Over System (MPN GS502-15275) provides a performance-oriented suspension solution for 4th generation F-Body owners seeking adjustable ride height and valving. This single-adjustable system features a simultaneous adjustment mechanism for rebound and compression, allowing you to dial in your suspension for street performance or track applications with a simple turn of the knob. The billet aluminum shocks feature a fully threaded body, providing up to 2 inches of ride height adjustment to achieve your desired stance and improve weight balance.

This kit includes American-made high-travel springs with a 275 lbs/in rate. These springs are designed with fewer coils and a smaller wire diameter to reduce unsprung weight and prevent coil bind, resulting in faster suspension reaction and increased travel. This bolt-in system is designed to work with either factory or QA1 tubular control arms.

• Valving: Single Adjustable (Simultaneous Compression and Rebound)
• Spring Dimensions: 15 inch Length x 275 lbs/in Rate
• Material: Lightweight Billet Aluminum Shock Bodies
• Adjustment: Up to 2 inches of Ride Height Adjustment
• Included Hardware: Sold in Pairs (Front)
• Quality Assurance: 100% Dyno Tested and Serialized
• Manufacturer Part Number: GS502-15275
• Warranty: Limited Lifetime Warranty
• Origin: Made in the USA

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

The QA1 GM Pro Coil System provides a bolt-in solution for drivers seeking precise ride height adjustment and valving control. These systems feature lightweight billet aluminum shocks with a single adjustment knob that simultaneously controls compression and rebound, allowing you to quickly tune your suspension for street performance, autocross, or drag racing. The included American-made high-travel springs are engineered with fewer coils and a smaller wire diameter to reduce unsprung weight and increase suspension travel compared to standard springs.

• Billet aluminum threaded shock bodies for easy ride height tuning
• Single adjustable valving (simultaneous compression and rebound)
• 11-inch high-travel springs with a 250 lbs/in spring rate
• Pigtail spring design for compatible factory-style mounting
• 100% dyno tested and serialized for quality assurance
• Fully serviceable and rebuildable design
• Includes all necessary hardware for a pair of front shocks
• Made in the USA
• Manufacturer Part Number: GS401-11250A

Fits select 1973-2004 Buick, Chevrolet, GMC, Oldsmobile, and Pontiac models including Monte Carlo, El Camino, S10, and Regal.

The QA1 GM Pro Coil System provides a direct bolt-in solution for drivers seeking precision control over ride height and shock valving. Featuring single-adjustable billet aluminum shocks, this system allows you to tune compression and rebound simultaneously via a single knob, making it easy to transition from street performance to track duty. The fully threaded shock bodies offer fine-tuned height adjustment to achieve the perfect stance and weight balance for superior handling.

This kit includes American-made high travel springs (10-inch length, 650 lbs/in rate). These springs are engineered with fewer coils and a smaller wire diameter to reduce unsprung weight and react faster to road inputs while providing increased travel. Every shock is 100% dyno tested and serialized to ensure consistent performance out of the box.

• Single adjustable valving (simultaneous compression and rebound)
• Lightweight billet aluminum coil-over shocks
• High travel 650 lb/in springs for improved suspension response
• Threaded body for precise ride height adjustability
• Serviceable and rebuildable design for longevity
• 100% Dyno tested and serialized
• Easy bolt-in installation with included hardware
• Made in the USA
• Manufacturer Part Number: GS401-10650C

Fits select 1973-2004 Buick, Chevrolet, GMC, Oldsmobile, and Pontiac vehicles, including El Camino, Monte Carlo, Malibu, S10, and Sonoma.

The QA1 GM Pro Front Coil-Over System is engineered to provide adjustable ride height and valving control for GM A-body, G-body, X-body, and S-series platforms. This kit features single-adjustable billet aluminum shocks that allow you to simultaneously tune compression and rebound valving with one knob to suit your driving style. The fully threaded shock body enables precise ride height adjustments for the perfect stance or improved corner weighting.

Paired with American-made lightweight high-travel springs, this system uses a specialized wire diameter and fewer coils to increase suspension travel while reducing unsprung weight. These components react faster than standard OE-style springs, optimizing handling for street performance, drag racing, and autocross. Each shock is 100% dyno tested and serialized at QA1's facility in the USA.

• Single adjustable valving for simultaneous compression and rebound control
• Lightweight billet aluminum threaded shock bodies
• 10-inch high-travel springs with a 550 lbs/in spring rate
• Direct bolt-in installation to factory mounting points
• Fully serviceable and rebuildable design
• Includes two (2) complete front coil-over assemblies
• Manufacturer Part Number: GS401-10550C
• Made in the USA

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

The QA1 GM Pro Coil System is engineered for drivers who demand precision ride height control and adjustable valving in a bolt-in package. This system replaces the factory front shock and spring with a high-performance coil-over conversion, featuring a single-adjustable knob that simultaneously tunes compression and rebound damping. Whether you are setting up for street performance, autocross, or drag racing, the fully threaded billet aluminum body allows you to dial in the perfect stance and optimize corner weights for superior handling.

This kit includes QA1 high-travel springs, manufactured in the USA from lightweight wire with fewer coils than standard springs. This design reduces unsprung weight and increases suspension travel by maximizing the distance between coils. Each shock is 100% dyno tested and serialized to ensure consistent performance right out of the box.

• Manufacturer Part Number: GS401-10500A
• Adjustment Type: Single Adjustable (Simultaneous Compression & Rebound)
• Spring Rate: 500 lbs/in
• Spring Length: 10 inches
• Material: Lightweight Billet Aluminum
• Mounting: Pigtail style lower mount for direct bolt-in installation
• Serviceability: Fully rebuildable and serviceable by QA1 authorized centers
• Origin: Made in the USA

Fits select 1967-1974 Chevrolet Camaro and Nova, Pontiac Firebird and Ventura, Buick Apollo, and Oldsmobile Omega models. This QA1 GM Pro Coil System offers a direct-fit solution for drivers seeking total control over stance and damping. The system features single-adjustable valving, allowing you to tune compression and rebound simultaneously with one knob to match your specific driving style, whether on the street or the track.

The shocks are constructed from lightweight billet aluminum with a fully threaded body, providing precise ride height adjustability for the perfect stance or improved weight corner balancing. Included are QA1 high-travel springs, which are engineered with fewer coils and a smaller wire diameter to increase suspension travel while reducing unsprung weight. Every shock is 100% dyno tested and serialized to ensure consistent performance out of the box.

• MPN: GS401-10450A
• Adjustment Type: Single Adjustable (Simultaneous Compression & Rebound)
• Spring Rate: 450 lbs/in
• Spring Length: 10 inches
• Spring Type: Pigtail
• Shock Material: Billet Aluminum
• Installation: Easy Bolt-In
• Origin: Made in the USA
• Quantity: Sold as a Pair

These units are fully serviceable and rebuildable by QA1 authorized centers, ensuring long-term reliability for your classic GM F-Body or X-Body vehicle.

Fits select 1968-1972 Buick Skylark, Chevrolet Chevelle/El Camino, GMC Sprint, Oldsmobile 442/Cutlass, and Pontiac GTO/LeMans models.

The QA1 Pro Coil System (GS401-10400B) provides a complete bolt-in solution for GM A-body owners seeking professional-grade handling and adjustable ride height. This single-adjustable system features a billet aluminum shock body that allows for simultaneous adjustment of compression and rebound valving via a single knob, making it easy to tune your suspension for street performance or drag racing. The fully threaded body allows for precise stance adjustments and corner balancing without removing the shocks from the vehicle.

Included in this kit are American-made high-travel springs with a 400 lbs/in rate. These springs utilize a specialized wire diameter and fewer coils to reduce unsprung weight and increase suspension travel compared to traditional coil-over springs. Every shock is 100% dyno tested and serialized to ensure consistent performance out of the box.

• Billet aluminum shock construction for lightweight durability
• Single adjustable valving for simultaneous compression and rebound control
• 10-inch high-travel springs (400 lbs/in) optimize suspension response
• Direct bolt-in installation to factory mounting points
• Fully serviceable and rebuildable design
• Includes flat spring seat hardware
• Manufacturer Part Number: GS401-10400B
• Made in the USA

Fits select 2007-2018 Chevrolet Silverado 1500 and GMC Sierra 1500 (2WD and 4WD).

The QA1 Pro-Coil system is a fully bolt-in front suspension solution designed to replace the factory equipment and provide total control over stance and damping. These double-adjustable coilovers feature independent tunability for both rebound and compression, allowing you to dial in your truck for street performance or track use. The threaded aluminum shock bodies enable easy ride height adjustments, offering a 1" to 3" drop with stock spindles or a 3" to 5" drop when paired with aftermarket drop spindles.

Engineered to handle the payload requirements of modern trucks, this heavy-duty system replaces maintenance-heavy spherical bearings with durable polyurethane bushings and a 1" chromoly T-bar. Made in Lakeville, Minnesota, these coilovers provide a significant upgrade in ride quality and handling response.

• Manufacturer Part Number: GD518-10950
• Adjustability: Double-adjustable valving (independent rebound and compression)
• Ride Height Drop: 1" to 3" (stock spindles) or 3" to 5" (drop spindles)
• Material: Threaded aluminum bodies with 1" chromoly T-bar
• Bushings: High-durometer polyurethane
• Installation: Fully bolt-in; no welding or custom fabrication required
• Origin: Made in the USA
• Warranty: Lifetime shock warranty (requires registration)