SKU: GS401-10550B | UPC: 806990062116
QA1 GM Pro Front Coil-Over System – Single Adj. – 10in x 550lbs/in – Flat – Aluminum for 1964-1972 GM A-Body
QA1 GS401-10550B front coil-over assembly upgrades 1964-1972 Chevrolet Chevelle, Pontiac GTO, El Camino, Buick Skylark, Oldsmobile 442, Cutlass, and other GM A-body vehicles with single adjustable valving and precise ride height tuning. This pair features 10 inch 550 lb/in high-travel springs with flat tapered ends, aluminum billet shock body, 10.13 inch compressed length, and 14 inch extended length for bolt-in performance gains in drag racing, street driving, autocross, and road racing. Threaded spring perch allows simple adjustments to match driving style and optimize handling balance.
Key Features
- Single Adjustable Valving: Tune compression damping to suit street cruise, drag launches, or track corners with 18 clicks of adjustment for responsive control
- Ride Height Adjustable: Fully threaded aluminum body and spring perch provide 2-3 inches of drop potential without altering bumpsteer or alignment
- High Travel Springs: Lightweight American-made coils with fewer windings and thinner wire deliver more suspension travel, quicker response, and reduced unsprung weight
- Billet Aluminum Construction: Durable lightweight shocks cut mass over stock components for sharper steering and faster weight transfer
- Dyno Tested and Serialized: Each unit 100% tested at QA1 factory with unique serial number, rebuildable at authorized centers for long-term reliability
Product Notes
- Sold as complete left and right pair for front installation
- Requires factory stock upper and lower control arm mounts
- Box dimensions 21 x 11 x 11 inches, product weight 19.2 lbs
Installation Notes
- Professional installation recommended.
- Bolt-in design uses OEM mounting holes, no fabrication needed for most A-body chassis
- Verify spring rate matches vehicle weight and tire setup, preload to factory ride height specs
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1968-1969 | Pontiac | Tempest | Custom |
| 1970 | Pontiac | Tempest | GT |
| 1968-1969 | Pontiac | Tempest | Safari |
| 1968-1972 | Chevrolet | Chevelle | Concours |
| 1969-1972 | Chevrolet | Chevelle | Concours Estate |
| 1969-1972 | Chevrolet | Chevelle | Greenbrier |
| 1968-1972 | Chevrolet | Chevelle | Malibu |
| 1968-1972 | Chevrolet | Chevelle | Nomad |
| 1968-1972 | Chevrolet | Chevelle | SS |
| 1968-1972 | Chevrolet | El Camino | Custom |
| 1968-1972 | Chevrolet | El Camino | SS |
| 1971-1972 | GMC | Sprint | Base |
| 1972 | GMC | Sprint | Custom |
| 1968-1971 | Oldsmobile | 442 | Base |
| 1968-1972 | Oldsmobile | Cutlass | Base |
| 1972 | Oldsmobile | Cutlass | Cruiser |
| 1968 | Oldsmobile | Cutlass | S |
| 1968-1972 | Oldsmobile | Vista Cruiser | Base |
| 1968-1972 | Pontiac | GTO | Base |
| 1970-1971 | Pontiac | GTO | The Judge |
| 1968-1972 | Pontiac | LeMans | Base |
| 1972 | Pontiac | LeMans | Luxury |
| 1969-1970 | Pontiac | LeMans | Safari |
| 1970-1972 | Pontiac | LeMans | Sport |
| 1971 | Pontiac | LeMans | T37 |
| 1970 | Buick | Skylark | 350 |
| 1972 | Buick | Skylark | 350 |
| 1968-1972 | Buick | Skylark | Base |
| 1968-1972 | Buick | Skylark | Custom |
| 1968-1969 | Buick | Special | Base |
| 1968 | Chevrolet | Chevelle | 300 |
| 1968-1969 | Chevrolet | Chevelle | 300 Deluxe |
| 1968 | Chevrolet | Chevelle | Base |
Why Choose QA1?
- Over 30 years leading motorsports suspension since 1993 with rod ends, bearings, and shocks
- 83,000 sq ft Lakeville MN factory produces dyno-tested components for racing and street
- Proven in drag, circle track, autocross, road race, and street rod applications worldwide
Frequently Asked Questions
- Q: Will this fit my 1966 Chevelle?
A: Yes, GS401-10550B fits all 1964-1972 GM A-body vehicles including early Chevelles using stock front mounts - Q: What materials are used in construction?
A: Billet aluminum shock body, high-strength steel internals, and lightweight steel high-travel springs designed for durability and reduced weight - Q: What is the warranty and service process?
A: Backed by QA1 limited lifetime warranty on manufacturing defects, fully rebuildable at authorized service centers across the US
Shipping & Handling
- Method: UPS or FedEx Ground
- Availability: In stock – ships same or next business day
- Packaging: Securely boxed 21 x 11 x 11 inches
- Weight: 19.2 lbs
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