QA1 RCK52376 Rear Pro-Coil Single-Adjustable Coilover Conversion Kit GM A-Body 1973-1977

The QA1 RCK52376 Rear Pro-Coil Coilover Conversion Kit is a bolt-in rear suspension upgrade engineered for 1973–1977 GM A-Body vehicles. Designed and manufactured in the USA, this kit replaces the factory rear shock and spring setup with a fully adjustable coilover system — requiring no cutting or welding for installation.

At the heart of this kit are two single-adjustable Proma Star aluminum shocks that deliver 18 positions of simultaneous rebound and compression adjustment, giving you precise control over your suspension tune whether you're driving the street or hitting the track. The fully threaded shock body allows for easy ride height adjustment to dial in the perfect stance or fine-tune corner weights for superior handling.

The included high-travel coilover springs are specially designed for QA1 Pro Coil systems — featuring fewer coils and a smaller wire diameter to maximize travel and reduce unsprung weight for faster, more responsive suspension performance. This kit includes 170 lb/in. springs on a 12-inch platform.

What's Included:

• 2 Single-Adjustable Proma Star Aluminum Shocks
• 2 High-Travel Coilover Springs (12 in., 170 lb/in.)
• USA-Made Mounting Brackets
• All Necessary Hardware

Key Features:

• Bolt-in installation — no cutting or welding required
• 18-position simultaneous rebound and compression adjustment
• Fully threaded shock body for ride height adjustment
• Reduces unsprung weight for improved suspension response
• 100% dyno tested and serialized
• Rebuildable and revalveable by QA1 factory or authorized service centers
• Eligible for QA1's Limited Lifetime Warranty (registration required)
• Made in the U.S.A.

Note: This kit will lower the vehicle. Later model vehicles tend to weigh more on average — take this into account when selecting spring rates. Lower shock mount bracket may not be compatible with aftermarket rear end housings.