QA1 DM501-12200 HD Pro Rear Weld-In Coilover Conversion Kit MOD Series 3.0" Axle 200 lb/in Spring

The QA1 DM501-12200 HD Pro Rear Weld-In Coilover Conversion Kit is a complete rear coilover solution engineered for performance builds on cars and trucks with 3.00-inch axle tubes. Designed for vehicles with 1,700–2,600 lbs. of rear axle weight, this weld-in kit delivers the strength, adjustability, and tunability demanded by drag racing, street performance, and street rod applications.

MOD Series Coilover Shocks:

This kit is equipped with QA1's MOD Series adjustable coilover shocks, purpose-built for top-tier builds that require maximum tunability and aggressive force curves. The MOD Series features modular valve packs that allow valving changes without removing the shocks from the vehicle — a major advantage for track-day tuning and ongoing suspension development.

Key Features:

• MOD Series shocks with on-car adjustable modular valve packs for precise damping tuning
• Double shear bracketry for increased strength under street and race loads
• Up to 9 inches of total ride height adjustability — axle-mounted brackets offer ¾" increments, with additional fine-tuning via the coilover shock collar
• Designed for 3.00-inch diameter axle tubes
• Tubular upper shock mount: 1-5/8" diameter × .095" wall, 40" long weld-in tube included
• 200 lb/in spring rate for performance street and mild race use
• 100% dyno tested and serialized shocks
• Revalveable and rebuildable by QA1 factory or authorized service centers
• Precision machined aluminum piston with PTFE piston band
• 5/8" centerless ground, hard chrome plated solid piston rod
• Three-step sealing system
• Made in the USA — manufactured in Lakeville, Minnesota
• Lifetime warranty on shocks (registration required at QA1.net/warranty)

Kit Includes:

• (2) MOD Series adjustable coilover shocks
• (2) 200 lb/in springs
• (1) 40" weld-in upper shock mount tube (1-5/8" dia. × .095" wall)
• All axle mount bracketry, tabs, and hardware

Installation Notes: Welding is required for installation. A QA1 spanner wrench (T114W or T115W, sold separately) is required for shock collar adjustment.