What kind of valving does this kit have?

This particular QA1 Pro Rear system features the MOD series shocks, which are double adjustable. That means you can independently adjust compression and rebound to fine-tune your suspension response. The adjustments are designed for smooth, predictable changes.

What axle tube size does this kit fit?

This QA1 DM501-12130 kit is designed to be welded to 3" diameter axle tubes. Make sure to measure your axle tubes before ordering to ensure proper fitment. QA1 also makes kits for other tube sizes.

Does this kit come with springs?

Yes, this QA1 Pro Rear System includes two linear or variable rate springs. The specific spring rate is 130 lbs/in for this particular kit. The springs are designed to work in conjunction with the included shocks for optimal performance.

QA1 Pro Rear Weld-In Coil-Over System - MOD Series - 12in x 130lbs/in - 3in Tube - Aluminum

QA1

Specifications

Brand: QA1
Part #: DM501-12130
UPC: 806990159489

QA1

QA1 Pro Rear Weld-In Coil-Over System - MOD Series - 12in x 130lbs/in - 3in Tube - Aluminum

Name: QA1 Pro Rear Weld-In Coil-Over System - MOD Series - 12in x 130lbs/in - 3in Tube - Aluminum
Brand: QA1
Price: 2347.44 USD
Availability: InStock

$2347.44

Weld-in coil-over kit for 3" axle tubes. Includes shocks, springs, and all mounting hardware.

Key Features

Lightweight aluminum — reduces unsprung weight
Ride height adjustable — fine-tune stance
5/8" piston rod — strong and smooth action
Revalveable and rebuildable — keep them running like new
Dyno tested and serialized — verified performance
Made in the USA

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Product Details

Upgrade your rear end with QA1's Pro-Rear System. Available in the MOD series, double adjustable, single adjustable and ride sensitive valving non-adjustable options,each adjustment has been carefully defined to provide the ideal horse curve to maximize performance. With evenly spaced valving changes throughout the adjustment range, there are no jumps when adjusting between any two clicks. These Pro-Rear Systems are commonly used in drag racing, street performance and street rod applications. Available in Simultaneous Compresion and Rebound Single Adjustable (DS), Independent Compression & Rebound Double Adjustable (DD) or Ride Sensitive Non-Adjustable (ALN), Coil-Over, Lightweight Aluminum, Ride Height Adjustable, Spring Mounting Hardware Included, 100% Dyno Tested and Serialized, Revalveable and Rebuildable by the QA1 Factory or QA1 Authorized Service Centers, Precision Machined Aluminum Piston with PTFE Piston Band, 5/8" Centerless Ground, Hard Chrome Plated, Solid Piston Rod, Three Step Sealing System, Available to Fit 3" or 3.25" Diameter Axle Tubes, Made in the USA, , Kit includes:, (2) Proma Star Shocks or Aluma Matic Shocks, (2) Linear or Variable Rate Springs, All Mounting Hardware.