QA1 GS501-11250A Front Pro Coil Single Adjustable Coilover System GM 11in Spring 250lb/in Tapered Pigtail

The QA1 GS501-11250A is a front Pro Coil single adjustable coilover shock system designed as a bolt-in upgrade for GM A-Body and Tri-5 vehicles. This complete kit includes a pair of lightweight billet aluminum single adjustable coilover shocks paired with 11-inch, 250 lb./in. rate high-travel conical springs featuring a tapered pigtail end. The shock body features a compressed length of 10.13 inches and an extended length of 17 inches.

Ride Height Adjustment:

• Up to 2 inches of ride height adjustability via the threaded aluminum shock body
• Simple spring seat nut adjustment — no special tools required for ride height changes
• Compatible with OE stamped steel control arms or QA1 tubular control arms for a true bolt-in installation

Valving & Tuning:

• 18-position simultaneous compression and rebound adjustment accessible at the base of the shock
• Dial in a comfortable street ride or a firm performance feel with a simple knob turn
• Adjustment knob is accessible by turning the steering wheel to full lock

Spring Specifications:

• Spring free length: 11 inches
• Spring rate: 250 lb./in.
• Tapered pigtail lower end design — seats on the coilover shock while the upper end locates in the factory spring bucket
• American-made high-travel springs with fewer coils and smaller wire diameter for increased suspension travel and reduced unsprung weight

Construction & Quality:

• Lightweight billet aluminum shock body construction
• 100% dyno tested and serialized at QA1's Lakeville, Minnesota facility
• Serviceable and rebuildable by QA1 Authorized Service Centers
• Sold as a pair with all necessary mounting hardware
• Suitable for street performance, pro-touring, autocross, road racing, and street rod applications

The GS501-11250A is backed by QA1's Limited Lifetime Warranty — register at QA1.net/Warranty to ensure coverage for as long as you own your vehicle. Spanner wrench P/N T114W or T115W is required for installation (sold separately). Optional thrust bearing kit P/N 7888-109 is also available.