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Qa1

QA1 Pro Rear Weld-In Coil-Over System - Double Adj. - 12in x 100/200lbs/in - 3.25in Tube - Aluminum

SKU: QAPDD501-100V1

Coilover Kits

QAP Coil-Overs - Weld-In...

Qa1

QA1 Pro Rear Weld-In Coil-Over System - Double Adj. - 12in x 100/200lbs/in - 3.25in Tube - Aluminum

SKU: QAPDD501-100V1

Coilover Kits

QAP Coil-Overs - Weld-In...

A$2,349.57
Special Order. Contact for ETA. This item is out of stock in our warehouse and partner distribution centres. In some cases, this may be due to not having live inventory feeds available for all suppliers. Please contact us before ordering if you need to meet a specific deadline.

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Description

QA1 Pro Rear Weld-In Coil-Over System - Double Adj. - 12in x 100/200lbs/in - 3.25in Tube - Aluminum

Additional Information

Pro-Rear System that includes two double adjustable custom mount coil-over shock kit and two springs with a variable rate of 100/200 and all mounting hardware.

Part Type

Coilover Adjustable Spring Lowering Kit

Product Overview

Upgrade your rear end with QA1's Pro-Rear System. Available in double adjustable, single adjustable and ride sensitive valving non-adjustable options, each adjustment has been carefully defined to provide the ideal force 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 compression and rebound single adjustable (DS), independent compression & rebound double adjustable (DD) or ride sensitive non-adjustable valving options. These coil-over shocks are made with lightweight aluminum and offer ride height adjustability. All mounting and spring mounting hardware included. Revalveable and rebuildable by the QA1 factory or QA1 Authorized Service Centers, they are 100% dyno tested and serialized and made in the USA. Kit includes: (2) Proma Star Shocks or Aluma Matic Shocks (2) Linear or Variable Rate Springs.

Data: v4.2 - Upd: 2026-11-08 12:24:46

Features

  • All mounting hardware included
  • Available with MOD Series, double, single or non-adjustable valving options
  • Excellent DIY solution for drag, street performance & street rodders alike
  • Made in the USA

Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.

Specifications

Product Details

Brand:QA1
Description:QA1 Pro Rear Weld-In Coil-Over System - Double Adj. - 12in x 100/200lbs/in - 3.25in Tube - Aluminum
Manufacturer Part Number:DD501-100V1
Part Number:qapDD501-100V1
Title:QA1 Shock Absorber and Coil Spring Assembly DD501-100V1
UPC:806990144706

Product Downloads

# Document Type Download
1. Installation Instructions

Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.

Data: v2 - Desc: v4.2 - Upd: 2026-11-08 11:55:28

Reference Information

Reference Data (Provide these details to our support team)
Brand Name/s Qa1
StreetFX SKU qapDD501-100V1
SFX Item ID 4093349
Accounting SKU qap-DD501-100V1
Manufacturer SKU DD501-100V1
Manufacturer UPC 806990144706
Alternative References DD501-100V1, QA1-DD501-100V1

Coilover Kits, Rear Pro Conversion System, Double-Adjustable, Aluminum, Clear Anodized Shocks, Silver Powdercoated Springs, 100-200 lbs./in. Rate, Kit

Here's an easy way to convert your stock rear suspension to a coilover suspension. You get everything you need with these QA1 Rear Pro coilover systems, from shocks to nuts and bolts, complete installation instructions, and even decals!

Product Attributes
BrandQA1
Manufacturer's Part NumberDD501-100V1
Part TypeCoilover Kits
Product LineQA1 Rear Pro Coilover Conversion Systems
UPC806990144706
Coilover Kit PositionRear
Adjustable ValvingYes
Number of Valving Selections324
Shocks IncludedYes
Internal DesignTwin-tube
Coilover Springs IncludedYes
Spring Rate (lbs./in.)100/200 lbs./in.
Suspension Height Adjustment0.0-1.5 in. lowered
Recommended Rear-End Weight1,050-1,300 lbs.
Gas ChargedNo
Extended Length (in.)16.88
Collapsed Length (in.)11.63
Upper MountBearing
Lower MountBearing
Body Diameter (in.)2.000
Shock Body MaterialAluminum
Shock Body FinishSilver
Bushing MaterialSteel
Bushing ColorNatural
Spring FinishGray/Silver
Crossmember IncludedNo
Adjustable Mounting Bracket IncludedYes
Hardware IncludedYes
Welding RequiredYes
QuantitySold as a kit.
NotesFor use with 3.250 in. diameter axles. Coilover shocks are double adjustable Proma Star DD501 shocks. Springs are 12 in. variable rate 12HT100/200 springs. Includes a 1.625 in. O.D. x 0.095 in. wall x 40.000 in. long weld-in tube.

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