SKU: DD501-12150 | UPC: 806990063144
QA1 Pro Rear Weld-In Coil-Over System – Double Adjustable – 12″ x 150 lb/in – 3″ Tube – Aluminum
The QA1 DD501-12150 Pro Rear Weld-In Coil-Over System is the ultimate custom suspension upgrade for drag racing, street performance, and street rod builds using 3″ rear axle tubes. This complete double-adjustable system features lightweight aluminum shocks with independent 18-position compression and 18-position rebound tuning (324 possible combinations), paired with 12″ high-travel 150 lb/in springs for excellent weight transfer and consistent performance. The weld-in design allows precise installation and ride height adjustment for the perfect stance and handling balance.
Key Features
- Double Adjustable Shocks: Independent compression and rebound tuning with 18 clicks each (324 combinations)
- 150 lb/in Springs: Lightweight high-travel rate ideal for drag, street, and performance applications
- 12″ Spring Length: Optimized for maximum travel and lowered setups
- 3″ Tube Specific: Designed for weld-in on vehicles with 3″ rear axle tubes
- Lightweight Aluminum Construction: Reduces unsprung weight for better performance
- Fully Rebuildable/Revalveable: Serviceable by QA1 or authorized centers
Specifications
| Specification | Detail |
|---|---|
| Part Number | DD501-12150 |
| Position | Rear Weld-In |
| Shock Type | Double Adjustable Aluminum |
| Spring Rate | 150 lb/in |
| Spring Length | 12″ |
| Axle Tube Diameter | 3 inches |
| Application | Custom Drag, Street Performance & Street Rod Builds |
| Installation | Weld-In Coil-Over Conversion |
| Country of Origin | United States |
| Warranty | Limited Lifetime (QA1) |
| Shipping Weight | Approx. 25-35 lbs |
What’s Included
- Pair of QA1 Double Adjustable Rear Coil-Over Shocks
- Pair of 12″ x 150 lb/in High-Travel Springs
- All Mounting Hardware & Brackets for 3″ Axle Tubes
- Detailed Installation Instructions
Product Notes
- Designed for weld-in installation on vehicles with 3″ rear axle tubes
- 150 lb/in spring rate is a lighter rate suitable for drag racing and street performance builds
- Professional welding and alignment recommended
- May require driveline angle adjustments depending on application
Installation Notes
- Estimated time: 6-10 hours (welding required), advanced difficulty
- Weld-in system requires professional fabrication skills
- Full rear alignment and driveline angle check required after installation
This Part Fits
| Application | Notes |
|---|---|
| Custom Builds with 3″ Rear Axle Tubes | Drag Racing, Street Performance, Street Rods – Weld-In |
Why Choose QA1 Pro Rear Weld-In Coil-Over System?
- Full double-adjustable control for perfect weight transfer and handling
- Lightweight aluminum shocks with high-travel springs for maximum performance
- Premium QA1 quality made in the USA with lifetime warranty confidence
Frequently Asked Questions
- Q: Is this a bolt-on or weld-in kit?
A: This is a weld-in system designed for 3″ rear axle tubes. - Q: What spring rate is included?
A: 150 lb/in lighter rate ideal for drag and street performance applications. - Q: What is the warranty?
A: Covered by QA1’s limited lifetime warranty.
Shipping & Handling
- Method: UPS / FedEx Ground
- Availability: In stock ships same or next business day
- Packaging: Secure protective packaging
- Weight: Approx. 25-35 lbs
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