QA1 GM Pro Front Coil-Over Shock Absorber - Single Adj. - Stock Mount - 10.125in/15in - Aluminum

Single-Adjustable Front Coil-Over Shock for Classic GM Muscle Cars and Trucks

The QA1 QAPGS501 Pro Front Coil-Over Shock is designed for classic GM A-Body, F-Body, G-Body, X-Body, and S-Series platforms running QA1 Pro Coil front suspension systems. Sold as a single shock without springs, this QAPGS501 unit pairs with QA1's high-travel front springs to build a complete coil-over setup on your Camaro, Chevelle, El Camino, Firebird, Nova, or Monte Carlo. The GS501 shock body is crafted from lightweight billet aluminum with a fully threaded body for ride height adjustability, 18 single-adjustable valving positions, and 100% dyno-tested performance. Every QA1 QAPGS501 is serialized and rebuildable through QA1 Authorized Service Centers, backed by QA1's Limited Lifetime Warranty.

Key Features

• Single adjustable valving with 18 settings to tune for street, drag, or road course use
• Lightweight billet aluminum shock body reduces unsprung weight on classic GM platforms
• Fully threaded body allows 0 to 2 inches of front ride height adjustment
• 10.125 inch compressed length, 15 inch extended length for proper Pro Coil geometry
• Stock mounting positions for true bolt-in installation, no cutting or welding required
• 100% dyno tested and individually serialized for traceability
• Serviceable and rebuildable by QA1 Authorized Service Centers
• Made in the USA by QA1
• Compatible with 1964-1988 GM A-Body, F-Body, G-Body, and X-Body front suspensions
• Limited Lifetime Warranty from QA1

Fitment

Specifications

What's Included

• 1x QA1 GS501 Pro Front Coil-Over Shock Absorber
• Installation hardware (spanner wrench P/N T114W or T115W required, sold separately)

About QA1

QA1 is a Minnesota-based manufacturer of high-performance suspension, driveshaft, and rod end components. Their Pro Coil shock lineup is engineered for classic muscle car applications where factory shock geometry does not accommodate aftermarket coil-over conversions. Every GS501 shock leaves their Lakeville, MN facility 100% dyno tested and serialized, and can be returned to any QA1 Authorized Service Center for rebuilding or revalving to maintain long-term performance.

Frequently Asked Questions

The QAPGS501 is the QA1 GS501 Pro Front Coil-Over Shock sold as a single unit without springs. It is designed for 1964-1988 GM A-Body, F-Body, G-Body, and X-Body platforms including Camaro, Firebird, Chevelle, El Camino, Nova, Monte Carlo, Malibu, Regal, Cutlass, and 1982-2004 S-10 / S-15 trucks running QA1 Pro Coil front suspension setups.

No. The QAPGS501 GS501 is the shock only. QA1 Pro Coil springs must be ordered separately. QA1 recommends spring rates based on vehicle front-end weight: 400 lb/in for small-block builds, 500 lb/in for big-block builds in most A-Body and F-Body applications. Refer to QA1's spring rate chart for your specific platform.

The GS501 shock features 18 valving positions adjustable via the knob at the top of the shock body. Turning the adjuster changes compression and rebound damping simultaneously. Lower settings provide a softer, more compliant ride; higher settings firm up the shock for performance driving or autocross use.

Standard hand tools are needed for the bolt-in installation. To set ride height using the threaded body adjustment, a spanner wrench is required (QA1 P/N T114W or T115W, sold separately). Optional thrust bearing kits (QA1 P/N 7888-109) can be added for smoother suspension articulation on lowered applications.

Yes. The GS501 shock is compatible with 1967-1969 Camaro and Firebird front suspension geometry at stock mounting positions. QA1 recommends 400 lb/in springs for small-block builds and 500 lb/in for big-block builds on these F-Body platforms. Refer to QA1 installation instructions for bump stop positioning specific to first-generation F-Body applications.

Yes. Every QAPGS501 GS501 shock is individually serialized and designed to be serviced and rebuilt by QA1 Authorized Service Centers. This keeps long-term ownership costs lower than replacement-only shocks and makes revalving possible as your build or driving style changes over time.

The fully threaded body on the QAPGS501 provides 0 to 2 inches of front ride height lowering adjustment. This allows fine tuning of front-end stance and weight distribution without changing springs or other suspension components.

The QAPGS501 is covered by QA1's Limited Lifetime Warranty for as long as you own the vehicle. Warranty registration is completed at QA1.net/Warranty. The lifetime warranty applies to QA1 single-adjustable shock absorbers used in normal performance driving applications.

The QAPGS501 is designed to accommodate 0 to 2 inches of front height reduction at stock mount locations. Running significantly lower than factory ride height may affect shock travel at full droop or full bump. Verify that the 10.125 inch compressed and 15 inch extended lengths work within your specific suspension geometry before installation on heavily modified cars.

Installation Notes

1. Safely lift and support the vehicle with jack stands under the frame, with front suspension hanging freely
2. Remove the factory front shocks from the stock upper and lower mount positions
3. Thread the spring perch collar onto the QAPGS501 shock body to your desired ride height position
4. Install QA1 Pro Coil spring onto the shock body, seating it between the lower perch and upper spring seat
5. Install the QAPGS501 assembly at the stock upper stud and lower bar pin mount positions, securing all hardware to vehicle torque specifications
6. Set the ride height adjustment using spanner wrench P/N T114W or T115W to achieve desired stance
7. Set valving adjustment to your starting point (typically 9 of 18 for street use) and adjust as needed through testing
8. Check alignment after installation and adjust caster, camber, and toe to QA1 specifications for your platform

WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.