QA1 GD501-10550C Front Pro Coil Double Adjustable Coilover Kit GM 10in. Spring 550 lb/in.

The QA1 GD501-10550C is a front Pro Coil double adjustable coilover shock kit engineered for GM muscle cars and performance vehicles. Featuring lightweight billet aluminum construction, this bolt-in kit upgrades the factory front suspension to a fully adjustable coilover system while maintaining compatibility with stock-mount upper shock locations.

The double adjustable shocks provide independent compression and rebound tuning, each with 18 positions of adjustment, delivering up to 324 unique valving combinations. Adjustments are made via easy-to-reach knobs at the base of the shock — simply turn the steering wheel to full lock for access. The fully threaded shock body enables up to 2 inches of ride height adjustment by turning the spring seat nut, allowing you to dial in the perfect stance without any cutting or fabricating.

Included is a 10-inch, 550 lb/in. rate high-travel coil spring with a tapered design and large flat upper end. The spring features fewer coils and a smaller wire diameter than OEM springs, resulting in greater suspension travel, reduced unsprung weight, and quicker response. The compressed shock length is 10.13 inches and the extended length is 17 inches. These kits bolt in with both OE stamped steel control arms and QA1 tubular control arms.

Key Features:

• Double adjustable twintube shock with independent 18-position compression and rebound knobs (324 valving combinations)
• Lightweight billet aluminum coilover shock body
• 10-inch, 550 lb/in. high-travel coil spring — tapered with large flat upper end
• Compressed length: 10.13 in. | Extended length: 17 in.
• Up to 2 inches of ride height adjustability via threaded spring seat
• Bolt-in installation — compatible with OE and QA1 tubular control arms
• 100% dyno tested and serialized
• Serviceable and rebuildable by QA1 Authorized Service Centers
• Suitable for street performance, drag racing, autocross, road racing, and street rod applications
• Covered by QA1 Limited Lifetime Warranty (registration required at QA1.net/Warranty)
• Made in the USA — sold in pairs

For spanner wrench access during installation and adjustment, QA1 recommends P/N T114W or T115W. Optional thrust bearing kit P/N 7888-109 is also available. This kit carries Emissions Code 4 and is subject to California Proposition 65 warnings.