QA1 GS401-10600A GM Pro-Coil Single Adjustable Front Coilover Kit 10in 600 lb/in Tapered Pigtail Springs Aluminum

The QA1 GS401-10600A is a front Pro-Coil single adjustable coilover conversion kit engineered for GM muscle cars seeking improved stance, ride quality, and handling performance. This complete bolt-in kit pairs lightweight billet aluminum single adjustable shocks with high-travel, USA-made tapered pigtail coil springs rated at 600 lb/in, providing a capable and tunable front suspension upgrade.

The single adjustable valving offers 1-way simultaneous rebound and compression adjustment, allowing you to dial in your preferred balance between comfort and performance with a simple turn of a dial. The 18-position adjustment knob is easily accessible by turning the steering wheel to full lock, making on-the-spot tuning straightforward. Ride height is adjustable up to 2 inches lower than stock by turning the spring seat nut, with the option to add drop spindles for additional lowering beyond that range.

The included 10-inch tapered pigtail coil springs are specially engineered for QA1's Pro-Coil systems with a smaller wire diameter and fewer coils than conventional springs of the same rate and length. This design maximizes usable travel, reduces unsprung weight, and allows the dampers to operate more efficiently. The kit bolts in with both factory OE stamped steel control arms or QA1 tubular control arms, making it a flexible upgrade for stock or modified suspensions.

Every QA1 shock is 100% dyno tested and serialized, and is serviceable and rebuildable by QA1 Authorized Service Centers. The shocks are manufactured in Lakeville, Minnesota, USA.

Kit Includes:

• (2) QA1 GS401 single adjustable billet aluminum coilover shocks
• (2) 10-inch tapered pigtail coil springs — 600 lb/in spring rate
• All necessary mounting hardware

Key Features:

• Single adjustable — 1-way simultaneous rebound and compression damping control
• 18-position adjustment knob for precise tuning
• Up to 2 inches of ride height adjustability via threaded spring seat
• Lightweight billet aluminum shock body construction
• High-travel, USA-made tapered pigtail coil springs
• Compatible with OE stamped steel or QA1 tubular control arms
• 100% dyno tested and serialized
• Serviceable and rebuildable by QA1 Authorized Service Centers
• Made in the USA

Backed by a QA1 1-year warranty against defects in materials and workmanship, this Pro-Coil kit is proven in drag racing, street performance, autocross, road racing, and street rod applications.