QA1 DS501-3001 HD Pro Rear Weld-In Coilover Conversion Kit, Single Adjustable, 300 lb/in Spring, 3.25" Axle

The QA1 DS501-3001 HD Pro Rear Coilover Conversion System is a complete weld-in kit engineered to bring true coilover suspension performance to cars and trucks running a 3.25" rear axle tube. Designed for vehicles with a rear axle weight between 1,700 and 2,600 lbs., this heavy-duty system delivers the strength and adjustability needed for street performance, street rod, and race applications.

Key Features:

• Single-Adjustable Proma Star Shocks: QA1's DS501 Proma Star twin-tube shocks feature simultaneous compression and rebound adjustment via a single dial, with 18 distinct valving positions for precise suspension tuning
• 300 lb/in Spring Rate: Heavy-duty linear rate coilover springs matched to higher rear axle weight applications
• 9" Total Ride Height Adjustability: Axle-mounted brackets provide 3/4" increment adjustments, while the coilover shock allows additional fine-tuning for a total of 9" of ride height range
• Double Shear Bracketry: Heavy-duty double shear axle mount brackets provide superior strength and support over standard single-shear designs
• Weld-In Tube Specs: Includes a 1-5/8" O.D. x .095" wall x 40" long tubular upper shock mount for clean, low-fabrication installation
• 100% Dyno Tested & Serialized: Every shock is dyno tested and serialized from the factory
• Revalveable & Rebuildable: Serviceable by QA1 or QA1-authorized service centers
• Made in the USA: Proudly manufactured in Lakeville, Minnesota
• Best-in-Class Lifetime Warranty: Register at QA1.net/warranty for lifetime shock coverage

What's Included:

• (2) Single-adjustable DS501 Proma Star coilover shocks
• (2) 300 lb/in coilover springs
• 40" long weld-in upper shock mount tube (1-5/8" O.D. x .095" wall)
• Axle mount bracketry, upper shock mounts, and all required hardware

Installation Notes: Welding is required. Designed specifically for 3.25" axle tubes. Use of QA1 spanner wrench T114W or T115W is required for spring collar adjustment. California Prop 65 warning applies.