QA1 DS501-2501 HD Pro Rear Weld-In Coilover Conversion Kit, 3.25" Axle, Single Adjustable, 250 lb/in Spring

The QA1 DS501-2501 HD Pro Rear Coilover Conversion System is a complete weld-in kit engineered to add high-performance coilover suspension to the rear of your car or truck. Designed for vehicles with a rear axle weight of 1,700–2,600 lbs., this kit delivers the hardware, bracketry, and shocks needed for a professional-grade coilover conversion without excessive fabrication work.

Featuring double shear bracketry and a 250 lb/in. spring rate, this system provides the strength and support required for both street performance and race applications. The single-adjustable QA1 Proma Star coilover shocks allow you to effortlessly dial in ride quality — from a comfortable street cruise to an aggressive performance feel — with a simple adjustment.

Ride Height Adjustability:

• Axle-mounted brackets offer adjustment in ¾" increments
• Coilover shock provides additional fine-tuning capability
• Up to 9" total ride height adjustability combined

Kit Includes:

• Two single-adjustable QA1 Proma Star coilover shocks
• Two 250 lb/in. coilover springs
• 40" long weld-in upper shock mount tube (1-5/8" O.D. x .095 wall)
• Axle mount bracketry and upper shock mounts
• All mounting hardware and tabs

Installation Notes:

• Welding required — designed as a weld-in solution
• Sized for 3.25" axle tubes
• Requires QA1 spanner wrench T114W or T115W (sold separately)

Proudly made in the USA at QA1's facility in Lakeville, Minnesota, this kit is backed by a lifetime warranty on QA1 shocks when registered at QA1.net/warranty.