QA1 RCK52372 Rear Pro-Coil Double Adjustable Coilover Conversion Kit GM A-Body 1973-1977

The QA1 RCK52372 is a bolt-in rear coil-over conversion kit engineered for 1973–1977 GM A-Body vehicles. Featuring double adjustable Proma Star aluminum shocks, this kit delivers serious suspension tunability for street performance and track-day use — with no cutting or welding required for installation.

The double adjustable shocks provide 18 positions of independent compression adjustment and 18 positions of independent rebound adjustment, resulting in 324 possible valving combinations for precise, customized damping control. The fully threaded shock body allows you to dial in your desired ride height for the perfect stance or to fine-tune weight balance for improved handling.

Included Pro Coil high-travel springs are American-made with fewer coils and a smaller wire diameter, creating greater spacing between coils for increased suspension travel. This design reduces unsprung weight and improves suspension response across a wide range of driving conditions — from daily street driving to competitive racing applications.

Kit Includes:

• 2 Double Adjustable Proma Star aluminum shocks
• 2 High-travel Pro Coil springs (170 lb/in rate, 12-inch)
• USA-made mounting brackets
• All necessary hardware

Key Features:

• Bolt-in installation — no cutting or welding required
• 324 total valving combinations (18 compression × 18 rebound positions)
• Fully threaded shock body for ride height adjustment
• 100% dyno tested and serialized
• Rebuildable and revalveable by QA1 factory or QA1 Authorized Service Centers
• Lowers vehicle ride height
• Made in the U.S.A.
• Limited Lifetime Warranty (register at QA1.net/Warranty)

Pair this rear kit with a QA1 adjustable front coil-over system for a complete suspension overhaul from front to rear. All QA1 double adjustable shocks are proudly manufactured in Lakeville, Minnesota.