QA1 DS501-130V1 Pro Rear Weld-In Coilover Conversion Kit Single Adjustable Proma Star 130/250 lb/in for 3.25in Axle

The QA1 DS501-130V1 is a complete Pro-Rear weld-in coilover conversion kit designed to upgrade your rear suspension from a leaf spring or stock configuration to a fully adjustable coilover setup. Engineered for drag racing, street performance, and street rod applications, this kit includes everything needed for a professional-grade rear suspension transformation.

Key Features:

• Single Adjustable Proma Star Shocks: Two DS501 single adjustable shocks with simultaneous compression and rebound adjustment — evenly spaced valving changes ensure smooth transitions between clicks with no sudden jumps in feel
• Variable Rate Springs: Two 12-inch 12HT130/250 variable rate coilover springs (130/250 lb/in), providing progressive spring rates for a balance of street comfort and performance handling
• 3.25-Inch Axle Tube Fitment: Designed specifically for vehicles with 3.25-inch diameter rear axle tubes
• Weld-In Upper Shock Mount Tube: Includes a 1.625 in. O.D. x 0.095 in. wall x 40 in. long weld-in tube for upper shock mounting
• Lightweight Aluminum Construction: Coilover shocks are manufactured from lightweight aluminum with ride height adjustability built in
• Complete Hardware Kit: All mounting brackets, spring mounting hardware, and necessary fasteners are included — no extra trips to the parts store
• 100% Dyno Tested and Serialized: Every shock is dyno tested and serialized for quality assurance before leaving the factory
• Revalveable and Rebuildable: Shocks can be revalved or rebuilt by the QA1 factory or any QA1 Authorized Service Center
• Made in the USA: Proudly manufactured in Lakeville, Minnesota

What's Included:

• (2) Single Adjustable Proma Star DS501 Coilover Shocks
• (2) 12-inch Variable Rate 12HT130/250 Springs
• 1.625 in. O.D. x 0.095 in. wall x 40 in. Weld-In Upper Shock Mount Tube
• Axle Mount Brackets and Tabs
• All Necessary Mounting Hardware
• Complete Installation Instructions

Installation Note: Welding is required. A QA1 spanner wrench (T114W or T115W) is needed for spring collar adjustment. This kit is commonly used in drag racing, street performance, and street rod builds.