-9%
QA1 Pro rear weld-in coil-over system full view
Click to zoom in

QA1 Pro Rear Weld-In Coil-Over System - Double Adj. - 12in x 150lbs/in - 3in Tube - Aluminum

QA1
QAPDD501-12150
806990063144
Coilovers
1 Units In Stock - Ships Next Business Day
$ 1,132.15 $ 1,021.95
$ 1,021.95

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

Request For Information

Have questions about QA1 Pro Rear Weld-In Coil-Over System - Double Adj. - 12in x 150lbs/in - 3in Tube - Aluminum? Fill out the form below and we'll get back to you by the next business day.
Coilovers

Coilovers

Coilovers from KW Suspension, Bilstein, FOX, ICON Vehicle Dynamics, Ohlins, Silver's NEOMAX, BC Racing, Fortune Auto, Ridetech, QA1, H&R, and Eibach are stocked at Black Ops Auto Works for street cars, track cars, off-road trucks, lift-application SUVs, and classic muscle car conversions. Every product is filterable by year, make, model, trim, and drivetrain so the correct coilover kit ships the first time. Black Ops Auto Works carries 1,646 coilover SKUs across non-adjustable, single-adjustable, double-adjustable, and remote-reservoir categories. What This Collection Covers A coilover combines a shock absorber and coil spring into a single adjustable unit with a threaded body for ride height adjustment. Coilovers offer purpose matched spring rates and damper valving that a lowering spring on a factory shock cannot replicate. Product Categories Non-adjustable coilovers, single-adjustable coilovers, double-adjustable coilovers, remote-reservoir coilovers, off-road lift coilov...

View Coilovers Products
Coilovers & Components

Coilovers & Components

Coilovers and coilover components are stocked at Black Ops Auto Works for trucks, SUVs, muscle cars, and street performance builds. Shop complete coilover kits, coilover springs, lowering springs, shock boots, dampening adjustment extenders, and suspension hardware for Ford, Toyota, Chevrolet, Jeep, Dodge, and Porsche platforms. Every product is filterable by year, make, model, trim, and drivetrain so the correct coilover setup ships the first time. Black Ops Auto Works carries 2,259 coilover and component SKUs across street, off-road, and track categories. What This Collection Covers Coilovers combine a coil spring and a shock absorber into a single adjustable unit, giving control over ride height and, on many models, damping stiffness. This collection also includes the individual components used to service, upgrade, or protect an existing coilover system. Product Categories Complete coilover kits, individual coilover shocks, coilover springs, lowering springs, protective shock...

View Coilovers & Components Products
QA1

QA1

QA1 suspension parts are stocked at Black Ops Auto Works for American muscle cars and classic trucks. Shop coilover kits, shock absorbers, springs, handling kits, four link systems, sway bars, strut kits, rod ends, and suspension hardware for the Mustang, Camaro, Corvette, Challenger, Charger, and GM B-Body, F-Body, and G-Body platforms. Every product is filterable by year, make, model, trim, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 536 QA1 SKUs across coilovers, shocks, springs, and handling kit categories. What This Brand Covers QA1 is a suspension manufacturer known for adjustable coilover systems, shock absorbers, and complete handling kits built for muscle cars, classic trucks, drag cars, and pro touring builds. The lineup covers everything from single component shock replacement to full vehicle handling packages. Brand Focus QA1 concentrates on American muscle car and classic truck platforms, with deep coverage of GM, Ford, and ...

View QA1 Products
Suspension

Suspension

Suspension parts and complete kits for cars, trucks, SUVs, Jeeps, and off-road builds are stocked at Black Ops Auto Works. Shop coilovers, lowering springs, lift kits, leveling kits, shocks and struts, sway bars, control arms, tie rods, ball joints, bushings, chassis bracing, alignment hardware, air suspension, and complete stage kits from Bilstein, KW, Ohlins, Fox, KING, ICON, BC Racing, Silvers, Eibach, H&R, Swift Springs, Whiteline, Energy Suspension, Moog, SPC Performance, Rough Country, ReadyLIFT, BDS, Skyjacker, Air Lift, Firestone, and Black Ops Auto Works. Start with a matched shock and spring package or a full coilover kit, then layer in sway bars, chassis bracing, and camber adjustment hardware. Every part is filterable by year, make, model, trim, and drivetrain to confirm fitment before ordering. What This Category Covers Suspension is the highest-leverage handling upgrade on any vehicle. A properly matched shock, spring, and sway bar package produces measurable i...

View Suspension Products
Military & First Responder Discounts

Military & First Responder Discount Program

Black Ops Auto Works proudly honors active duty military, veterans, National Guard, reserves, police officers, firefighters, and EMTs with an exclusive 5% discount on all performance parts and carbon fiber upgrades. Verify instantly and start saving today.

Learn More & Apply

Your cart

×