QA1 GS401-10750C GM Front Pro Coil Single-Adjustable Coilover Shock Kit 750 lb/in Spring

The QA1 GS401-10750C is a front Pro Coil single-adjustable coilover shock kit designed for GM muscle cars and classic vehicles. Featuring lightweight billet aluminum construction, this kit pairs a 10-inch, 750 lb/in spring (large tapered flat end) with a single-adjustable twin-tube shock — delivering a significant upgrade over stock suspension in both performance and stance.

The shock body features a fully threaded design for ride height adjustability, with up to 2 inches of drop achievable through a simple turn of the spring seat nut. The 18-position simultaneous compression and rebound adjustment knob lets you dial in the perfect balance between a comfortable street ride and a more aggressive performance feel — all without tools.

Key Specifications:

• Spring Length: 10 inches
• Spring Rate: 750 lb/in
• Spring End Style: Large tapered flat
• Compressed Length: 8.63 inches
• Extended Length: 12.88 inches
• Adjustability: Single-adjustable (simultaneous compression and rebound), 18 positions
• Construction: Lightweight billet aluminum shock body
• Sold as a pair

Key Features:

• Up to 2 inches of ride height adjustability via threaded shock body
• Compatible with OE stamped steel or QA1 tubular control arms — bolt-in installation
• 100% dyno tested and serialized at the factory
• Serviceable and rebuildable by QA1 Authorized Service Centers
• Proudly made in Lakeville, Minnesota, USA
• Backed by QA1's Limited Lifetime Warranty (registration required at QA1.net/Warranty)

The GS401-10750C is an excellent choice for street performance, autocross, road racing, and street rod applications where adjustable ride height and valving control are essential.