QA1 GD501-10550A Front Pro Coil Double Adjustable Coilover Shock Kit GM 550 lb/in Tapered Pigtail

The QA1 GD501-10550A is a front Pro Coil double adjustable coilover shock kit engineered for GM applications. Built around QA1's lightweight billet aluminum twin-tube shock body, this kit delivers fully independent compression and rebound valving control with 324 valving combinations, allowing precise tuning for everything from street cruising to performance driving. The fully threaded shock body provides up to 2 inches of ride height adjustment, making it easy to dial in the perfect stance or optimize front-end weight balance without replacing control arms.

Included is a 10-inch high-travel tapered pigtail spring rated at 550 lb/in, specifically designed for applications with big block engines (recommended front-end weight: 2,101–2,200 lbs). QA1's American-made Pro Coil springs feature fewer coils and a reduced wire diameter compared to conventional springs, increasing travel distance between coils for improved suspension response and reduced unsprung weight.

Key Features:

• Double adjustable twin-tube aluminum shock — independent compression and rebound control
• 324 valving combinations for maximum tunability
• Fully threaded shock body with up to 2.0" ride height adjustment range
• Compressed length: 10.13" | Extended length: 17.00" | Threaded adjustment range: 3.0"
• Includes 10" tapered pigtail (10HTSP550) coilover spring rated at 550 lb/in
• Designed for big block GM applications (front-end weight: 2,101–2,200 lbs)
• Lightweight billet aluminum construction reduces unsprung weight
• 100% dyno tested and serialized at the factory
• Serviceable and rebuildable by QA1 Authorized Service Centers
• Made in the USA

This kit installs using the stock upper mount location and a T-bar type lower mount for a straightforward bolt-in upgrade. Note: Some applications may require enlarging the control arm's shock opening for proper fitment. T-bar mount lengths are measured to the center of the loop.