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QA1 DD501-12100V Pro Rear Weld-In Coilover Kit Double Adjustable Shock 100/200 lb/in Spring 3.00in Axle

Manufacturer

Picture for manufacturer QA1 Precision Products

Part Number

DD501-12100V
13 reviews
Sale Price

$1,060.95

Estimated ship date Monday, November 23

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Live-in-stock inventory

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Fitment guaranteed

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Product Details

The QA1 DD501-12100V Pro Rear Weld-In Coilover Kit is a complete rear suspension conversion system featuring double adjustable Proma Star coilover shocks and variable-rate springs. Designed for drag racing, street performance, and street rod applications, this weld-in kit delivers precise, tunable handling right out of the box.

At the heart of this kit are QA1's DD501 Proma Star double adjustable shocks, which allow independent tuning of both compression and rebound damping across 18 positions each. With evenly spaced valving increments, there are no abrupt transitions between clicks—just smooth, predictable adjustability whether you're setting up for the strip or the street.

Key Features:

  • Includes two (2) DD501 Proma Star double adjustable coilover shocks
  • Includes two (2) variable-rate 12-inch springs rated at 100/200 lb/in
  • Designed for 3.00-inch diameter axle tubes (welding required)
  • All mounting hardware included: axle mount bracketry, upper shock mounts, and 1-5/8" O.D. x .095 wall x 40" weld-in tube
  • Up to 9 inches of total ride height adjustability — axle brackets offer 3/4" increments, with additional fine-tuning via the coilover shock
  • Lightweight aluminum shock body with precision-machined aluminum piston and PTFE piston band
  • 5/8" centerless ground, hard chrome plated solid piston rod
  • Three-step sealing system for long-term durability
  • 100% dyno tested and serialized
  • Revalveable and rebuildable by QA1 factory or authorized service centers
  • Made in the USA

Installation Notes: Welding is required for installation. A QA1 spanner wrench (P/N T114W or T115W, sold separately) is needed for ride height adjustment. An optional thrust bearing kit (P/N 7888-109) is also available separately.

Backed by QA1's Limited Lifetime Warranty (registration required at QA1.net/warranty), this Pro Rear system is a proven solution for adding coilover performance to custom, muscle car, and performance truck builds.

Products specifications

Adjustable Mounting Bracket Included

Yes

Adjustable Valving

Yes

Bushing Color

Natural

Bushing Material

Steel

Coil-Over Kit Position

Rear

Coil-Over Springs Included

Yes

Collapsed Length (in)

11.625 in.

Crossmember Included

Yes

Extended Length (in)

17.000 in.

Gas Charged

No

Lower Mount

Eyelet

Notes

Includes 12 in. coil-over springs. Shocks are remote ready, they can be used with the QA1 two or four channel remote adjustable system.

Number of Valving Selections

576

Quantity

Sold as a kit.

Recommended Rear-End Weight

1,050-1,300 lbs.

Shock Body Finish

Clear anodized

Shock Body Material

Aluminum

Shocks Included

Yes

Spring Finish

Silver powdercoated

Spring Rate (lbs/in)

100/200 lbs./in.

Suspension Height Adjustment

Stock

Upper Mount

Eyelet

Variable Rate Springs

1050-1300 lbs (12-100/200 Springs)

Welding Required

Yes

Prop 65

WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov

Title

QA1 Shock Absorber and Coil Spring Assembly DD501-12100V

Needed what I wanted. Very easy checkout!

Utilized customer support for question on particular item. Phone answered immediately, consultant answered questions and I was able to place order immediately. This second purchase was due to the initial experience. Will make future purchases from Autoplicity.

I found them doing a search for a clutch kit, they are hands down one of the easiest companys to work with and the prices cant be beat..... I looked everywhere

I called to make sure they had it in stock and when it would ship which was told same day as ordered. Just what I wanted to hear.

Autoplicity Highly Recommended!!! I placed an order on Monday and even though I used ground shipping I had that order in hand two days later on Wednesday! (Order Number: 17813) Fantastic PriceΓÇÖs and the Fastest Shipping on the web! Amazon Payments was fast and easy to use. I will absolutely be checking Autoplicity First for all my future auto needs. Thanks for the Great PriceΓÇÖs and Service! Keep up the good work!

Wow! Super fast delivery, excellent communication, will definitely do business with again.

Very fast service order arrived next day after they shipped it.<br>product looked great except for the bottom bolt brackets were slightly bent but that could have happened during shipment. Otherwise I'm happy with the transaction!

Every thing is very good so far.

Convenient Amazon checkout

Easy ordering process!

Good

I will use this site for all my "hard to find" car parts!!!!

Great seller! good communication between autoplicity and buyer!<br>Also very quick to process and send out product! Got order within 6 days standard shipping! Will purchase from again!!

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