QA1 GD401-10350B Front Double Adjustable Pro Coil-Over System 350 lb/in Spring

The QA1 GD401-10350B is a front double adjustable Pro Coil coilover system designed as a bolt-in performance suspension upgrade for 1968–1972 GM A-Body and related platforms. Featuring lightweight billet aluminum shocks paired with high-travel, USA-made coil springs, this kit delivers fully adjustable ride height and precise valving control for street performance, autocross, road racing, and drag racing applications.

Double Adjustable Valving:

The GD401 shock offers independent compression and rebound adjustment — 18 positions of rebound and 18 positions of compression — providing 324 unique valving combinations. The fully threaded shock body allows ride height adjustment for the perfect stance or fine-tuned corner weight balance. The 18-position adjustment knob is easily accessible by turning the steering wheel to full lock.

High-Travel Pro Coil Springs:

The included 10-inch tapered flat-end springs (part style 10HTSF350) are rated at 350 lb/in and recommended for front end weights of 1,701–1,800 lbs. Fewer coils and a smaller wire diameter increase travel by widening the gap between coils, reducing unsprung weight and improving suspension response.

Key Features:

• Spring Rate: 350 lb/in
• Spring Length: 10 in. tapered with flat upper end (style 10HTSF350)
• Compressed Height: 9.0 in.
• Extended Height: 12.8 in.
• Upper Mount: Stud
• Lower Mount: T-Bar
• Recommended Front End Weight: 1,701–1,800 lbs
• Independent compression and rebound double adjustment — 324 valving combinations
• Lightweight billet aluminum shock body with fully threaded ride height adjustment
• High-travel, USA-made coil springs with reduced unsprung weight
• Compatible with OE stamped steel or QA1 tubular control arms
• 100% dyno tested and serialized
• Serviceable and rebuildable by QA1 Authorized Service Centers
• Limited Lifetime Warranty
• Made in the USA (Lakeville, MN)
• Sold in pairs

The GD401-10350B bolts in using either stock OE stamped steel control arms or QA1 tubular control arms, providing a straightforward upgrade path with no custom fabrication required. Designed for small-block engine applications. Note: Some front applications may require the lower A-arm to be dropped for installation, and some control arm shock openings may need to be enlarged to accept the QA1 shock body.