QA1 DM501-3001 HD Pro Rear Weld-In Coilover Conversion Kit MOD Series 300lb/in Spring 3.25in Axle

The QA1 DM501-3001 is a Heavy Duty Pro Rear Weld-In Coilover Conversion System built for serious street and race applications. Designed for vehicles with a rear axle weight between 1,700 and 2,600 lbs., this complete kit delivers everything needed to convert your rear suspension to a fully adjustable coilover setup without extensive fabrication.

At the heart of this system are two MOD Series coilover shocks — QA1's most tunable shock offering. These shocks feature modular valve packs that allow valving changes without removing them from the car, along with high-speed and low-speed bleed adjustability, making them equally capable on the street or down the drag strip.

Key Features:

• MOD Series Adjustable Shocks: Modular valve packs enable on-car valving changes for aggressive force curves and maximum tunability
• 300 lb/in Spring Rate: High spring rate tuned for performance street and race use
• 3.25-Inch Axle Tube Compatibility: Specifically designed for 3.25" diameter axle tubes
• 9" Total Ride Height Adjustability: Axle-mounted brackets provide 3/4" increment adjustments; coilover shock allows additional fine-tuning
• Double Shear Bracketry: Heavy-duty construction for strength and support in demanding applications
• 40" Weld-In Tube Included: Tubular upper shock mount — 1-5/8" diameter x .095" wall x 40" long — supplied with the kit
• Lightweight Aluminum Construction: Precision machined aluminum piston with PTFE piston band
• 5/8" Piston Rod: Centerless ground, hard chrome plated solid piston rod with three-step sealing system
• 100% Dyno Tested and Serialized: Each shock is individually tested and traceable from the factory
• Revalveable and Rebuildable: Serviceable by QA1 factory or authorized service centers
• Made in the USA: Proudly manufactured in Lakeville, Minnesota

What's Included:

• (2) MOD Series adjustable coilover shocks
• (2) 300 lb/in linear rate springs
• 40" weld-in upper shock mount tube (1-5/8" OD x .095" wall)
• Axle mount bracketry and upper shock mounts
• All necessary mounting hardware and tabs

Installation Notes: Welding is required for installation. Requires use of QA1 spanner wrench T121W (sold separately). This system is commonly used in drag racing, street performance, and street rod builds.