QA1 DD501-175V1 Pro-Rear Weld-In Coilover Kit Double Adjustable Proma Star Shock 175/350 lb/in Spring 3.25in Axle

The QA1 DD501-175V1 Pro-Rear Weld-In Coilover Conversion Kit is a complete rear suspension upgrade designed for drag racing, street performance, and street rod applications. This kit pairs double adjustable Proma Star coilover shocks with purpose-built mounting hardware and springs for a bolt-in or weld-in rear coilover solution.

Double Adjustable Proma Star Shocks: The heart of this kit is the QA1 DD501-series Proma Star shock, which features independent compression and rebound adjustment. Each adjustment click is evenly spaced throughout the range, eliminating any jumps between settings and allowing precise, predictable damping tuning. The shocks are constructed with lightweight aluminum and offer full ride height adjustability via the coilover perch.

Kit Contents:

• (2) Double Adjustable Proma Star DD501 coilover shocks
• (2) 12 in. coilover springs — 175/350 lb/in. dual-rate spring rate
• Axle mount bracketry for 3.25 in. diameter axle tubes
• Upper shock mount hardware and weld-in tubing
• All necessary hardware for installation

Ride Height Adjustability: The axle-mounted brackets provide ¾ in. increment adjustability, and the coilover shock allows additional fine-tuning — delivering a combined total of 9 inches of ride height adjustability for complete stance control.

Applications: Commonly used in drag racing, street performance, and street rod builds. This kit is designed for vehicles with a rear axle featuring a 3.25 in. diameter axle tube and rear axle weights in the appropriate range for 175/350 lb/in. spring rates.

QA1 Pro-Rear Systems are a proven, straightforward solution to add a fully functional coilover rear suspension to virtually any rear-axle equipped vehicle — giving you the handling, adjustability, and performance control you need on the street or strip.