SKU: RCK52385 | UPC: 806990147448
QA1 78-96 GM B-Body Pro Rear Coil-Over System – Single Adjustable – 12″ x 300 lb/in – Aluminum
The QA1 RCK52385 Pro Rear Coil-Over Conversion System is the ultimate bolt-in upgrade for your 1978-1996 GM B-Body (Caprice, Impala, etc.). This complete system replaces the factory leaf springs with modern single-adjustable aluminum coil-overs featuring 300 lb/in springs, delivering 2.5″ to 5.5″ of adjustable rear drop, vastly improved ride quality, and superior handling. The single-adjustable shocks offer 18 positions of simultaneous rebound and compression adjustment, while the fully threaded body allows precise ride height tuning for the perfect stance or weight balance. Lightweight high-travel springs and precision-machined aluminum components reduce unsprung weight and provide consistent performance from street cruising to weekend track days.
Key Features
- Single Adjustable Shocks: 18 positions of simultaneous rebound & compression adjustment
- 300 lb/in High-Travel Springs: Medium rate optimized for most street and performance B-Body builds
- 12″ Spring Length: Ideal for lowered applications with excellent travel
- Fully Threaded Aluminum Body: Easy ride height adjustment from 2.5″ to 5.5″ drop
- Bolt-In Design: Direct replacement for factory leaf springs no cutting or welding
- Lightweight & Durable: Reduces unsprung weight while maintaining strength
Specifications
| Specification | Detail |
|---|---|
| Part Number | RCK52385 |
| Position | Rear |
| Shock Type | Single Adjustable Aluminum Coil-Over |
| Spring Rate | 300 lb/in |
| Spring Length | 12″ |
| Drop Range | 2.5″ – 5.5″ |
| Compatibility | 1978-1996 GM B-Body (Chevrolet Caprice, Impala, Buick, Oldsmobile, Pontiac) |
| Installation | Bolt-On Coil-Over Conversion |
| Country of Origin | United States |
| Warranty | Limited Lifetime (QA1) |
| Shipping Weight | Approx. 55-65 lbs |
What’s Included
- Pair of QA1 Single Adjustable Aluminum Rear Coil-Over Shocks
- Pair of 12″ x 300 lb/in High-Travel Springs
- Specially Designed USA-Made Mounting Brackets
- All Necessary Hardware & U-Bolts
- Detailed Installation Instructions
Product Notes
- Designed for 1978-1996 GM B-Body vehicles (Caprice, Impala, etc.)
- Later model B-Bodies tend to weigh more contact QA1 tech for spring rate questions
- Professional installation and rear alignment recommended
Installation Notes
- Estimated time: 6-10 hours, moderate to advanced difficulty
- Bolt-on conversion removes factory leaf springs and installs coil-overs
- Full rear alignment and driveline angle check required after installation
This Part Fits
| Year | Make | Model | Notes |
|---|---|---|---|
| 1978 to 1996 | Chevrolet | Caprice / Impala | All B-Body Configurations (Sedan, Wagon) |
| 1978 to 1996 | Buick | LeSabre / Roadmaster | B-Body Models |
| 1978 to 1996 | Oldsmobile | Delta 88 / Ninety-Eight | B-Body Models |
| 1978 to 1996 | Pontiac | Bonneville / Parisienne | B-Body Models |
Why Choose QA1 Rear Coil-Over Conversion System?
- Modern coil-over performance with classic B-Body styling and stance
- Full adjustability for the perfect ride height and handling balance
- Premium QA1 quality with lifetime warranty confidence
Frequently Asked Questions
- Q: Will this kit fit my 1995 Chevrolet Caprice?
A: Yes, RCK52385 is a direct fit for all 1978-1996 GM B-Body vehicles. - Q: What spring rate is included?
A: 300 lb/in medium rate ideal for most street-driven B-Bodies. - Q: Is an alignment required?
A: Yes, a full rear alignment is required after installation. - Q: What is the warranty?
A: Covered by QA1’s limited lifetime warranty.
Shipping & Handling
- Method: UPS / FedEx Ground (Oversize)
- Availability: In stock ships same or next business day
- Packaging: Secure protective packaging
- Weight: Approx. 55-65 lbs
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