QA1 ALN1500K Pro-Rear Aluminum Custom-Mount Coilover Conversion Kit with Variable Rate Springs

The QA1 ALN1500K Pro-Rear Coilover Conversion System is a custom-mount rear suspension upgrade designed for hot rods, pro-street builds, street rods, and drag cars. This kit includes two lightweight aluminum coilover shocks paired with two variable rate springs and all required mounting hardware, giving you a complete rear coilover conversion solution. Note: some welding is required. Leaf spring vehicles currently using ladder bars will require a track locator for proper installation. Designed to fit a 3-inch axle tube.

QA1's Pro-Rear systems are available in three shock configurations — Ride Sensitive, Single Adjustable, and Double Adjustable — each sharing a robust aluminum construction and the same core quality standards, including 100% dyno testing and serialization.

What's Included:

• (2) Pro-Rear aluminum coilover shocks
• (2) Variable rate coilover springs (100–200 lb/in)
• All required mounting hardware

Ride Sensitive Configuration:

Self-adjusting, ride-sensitive valving automatically responds to road conditions, delivering economical performance without sacrificing comfort. Recommended for street rods and hot rods seeking a budget-friendly upgrade without manual tuning.

Single Adjustable Configuration:

Features an 18-position knob that simultaneously adjusts both compression and rebound damping in a single motion. Ideal for pro-street and street rod applications where simplified tuning is preferred.

Double Adjustable Configuration:

Offers independent compression and rebound adjustment with evenly spaced valving increments throughout the full range — no sudden jumps between clicks. Covers a wide spectrum from soft street comfort to stiff performance handling, making it the most versatile option for demanding builds.

Key Features (All Configurations):

• Lightweight aluminum construction for reduced unsprung weight
• Ride height adjustable coilover design
• 100% dyno tested and serialized for quality assurance
• Revalveable and rebuildable by the QA1 factory or QA1 Authorized Service Centers
• American made in Lakeville, Minnesota
• Precision machined aluminum piston with P.T.F.E. piston band
• 5/8-inch centerless ground, hard chrome plated, solid piston rod
• Three-step sealing system for long-term durability
• Spring mounting hardware included

Built in the USA and backed by QA1's commitment to quality, the ALN1500K delivers professional-grade rear suspension performance for custom street and performance builds.