QA1 GS401-11300B Front Pro Coil Single Adjustable Coilover System GM 11in 300lb/in

The QA1 GS401-11300B is a front Pro Coil single-adjustable coilover shock system designed for GM muscle cars. Featuring a lightweight billet aluminum shock body, this kit delivers a significant upgrade over stock suspension with adjustable ride height and tunable valving for both street and performance driving applications.

The system includes a compressed length of 10.13" and an extended length of 14", paired with an 11-inch tapered flat-end spring rated at 300 lb/in. The fully threaded shock body provides up to 2 inches of ride height adjustability, allowing precise stance tuning with a simple turn of the spring seat nut. A spanner wrench (P/N T114W or T115W) is required for adjustment.

Key Features:

• Single-adjustable valving with an 18-position rebound adjustment knob for dialing in comfort or performance
• Lightweight billet aluminum coilover shock construction
• Compressed length: 10.13" / Extended length: 14"
• Includes 11" tapered flat-end spring at 300 lb/in spring rate
• Up to 2" of ride height adjustability via threaded shock body
• Bolt-in installation compatible with OE stamped steel or QA1 tubular control arms
• 100% dyno tested and serialized at the factory
• Serviceable and rebuildable by QA1 Authorized Service Centers
• Made in the USA in Lakeville, Minnesota
• Sold in pairs

QA1 Pro-Coil springs are American-made, high-travel units with fewer coils and a smaller wire diameter for increased suspension travel and reduced unsprung weight. The 18-position adjustment knob is easily accessible by turning the steering wheel to full lock. This kit qualifies for QA1's Limited Lifetime Warranty upon registration at QA1.net/Warranty.