QA1 DS501-12150 Pro-Drag Rear Coilover Shock Kit Single Adjustable 150 lb/in Springs

The QA1 DS501-12150 is a Pro-Drag Rear Coilover Shock Kit engineered for vehicles with a rear axle weight of 1,501–1,700 lbs. This weld-in kit delivers a complete rear coilover upgrade for drag racing, street performance, and street rod builds—everything you need is included for a seamless installation.

At the heart of this kit are two QA1 Proma Star single-adjustable coilover shocks, featuring simultaneous compression and rebound valving adjustment. With evenly spaced valving changes across the full adjustment range, transitions between clicks are smooth and predictable, allowing precise tuning for your specific application. The shocks are constructed with lightweight aluminum for a favorable strength-to-weight ratio.

Paired with the shocks are two 150 lb/in linear rate springs, matched to the vehicle weight range for consistent, repeatable performance at the track or on the street. Axle-mounted brackets provide ride height adjustability in ¾-inch increments, with additional fine-tuning available through the coilover shock itself.

Kit Includes:

• 2 × QA1 Proma Star single-adjustable coilover shocks
• 2 × 150 lb/in linear rate springs
• Axle mount bracketry and upper shock mounts
• All mounting hardware

Key Features:

• Designed for vehicles with 1,501–1,700 lb. rear axle weight
• Single-adjustable (simultaneous compression and rebound) Proma Star shocks
• 150 lb/in linear rate springs for consistent performance
• Ride height adjustable in ¾-inch increments
• Lightweight aluminum shock construction
• Ideal for drag racing, street performance, and street rod applications
• Made in the USA — Lakeville, Minnesota
• Eligible for QA1 Limited Lifetime Warranty (registration required at QA1.net/Warranty)

The QA1 DS501-12150 Pro-Drag rear coilover kit is the trusted choice for builders looking to add serious suspension performance to their custom car or truck with a proven, race-developed weld-in system.