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QA1 ALN4000K Pro Rear Weld-In Coilover Conversion Kit Non-Adjustable 175/350 lb/in

Manufacturer

Picture for manufacturer QA1 Precision Products

Part Number

ALN4000K
6 reviews
Sale Price

$789.95

Estimated ship date Monday, November 23

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Fitment guaranteed

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Product Details

The QA1 ALN4000K is a Pro Rear Weld-In Coilover Conversion System designed for hot rods, pro-street builds, street rods, and drag cars running a 3.00-inch axle tube. This kit features QA1's Aluma-Matic non-adjustable, ride-sensitive shock — a self-adjusting valving design that delivers reliable performance and a comfortable ride without the need for manual tuning. The lightweight clear-anodized aluminum body keeps unsprung weight to a minimum while resisting corrosion.

The kit includes two coilover shocks paired with 12-inch variable rate springs rated at 175–350 lbs/in, making it well-suited for rear-end weights between 1,551 and 1,850 lbs. All necessary spring mounting hardware is included. Note: Some welding is required for installation. Leaf spring vehicles currently using ladder bars will require the use of a track locator to complete the installation.

Key Features:

  • Aluma-Matic Non-Adjustable, Ride-Sensitive Valving — self-adjusting for economical performance
  • Lightweight clear-anodized aluminum shock body
  • 12-inch coilover springs, 175–350 lbs/in variable rate
  • Ride height adjustable design
  • Eyelet upper shock mount
  • Precision machined aluminum piston with P.T.F.E. piston band
  • 5/8-inch centerless ground, hard chrome plated, solid piston rod
  • Three-step sealing system
  • 100% dyno tested and serialized
  • Revalveable and rebuildable by QA1 factory or QA1 Authorized Service Centers
  • Spring mounting hardware included
  • American made
  • Designed for 3.00-inch axle tube

Every QA1 shock is 100% dyno tested and individually serialized to guarantee consistent, high-quality performance. The ALN4000K is a purpose-built solution for builders who want a proven, low-maintenance rear coilover conversion at a practical price point.

Products specifications

Adjustable Mounting Bracket Included

Yes

Adjustable Valving

No

Bushing Color

Natural

Bushing Material

Steel

Coil-Over Kit Position

Rear

Coil-Over Springs Included

Yes

Collapsed Length (in)

11.125 in.

Crossmember Included

Yes

Extended Length (in)

16.250 in.

Gas Charged

No

Lower Mount

Eyelet

Notes

Included 12 in. coil-over springs.

Quantity

Sold as a kit.

Recommended Rear-End Weight

1,551-1,850 lbs.

Recommended Vehicle Weight (lbs)

1,551-1,850

Shock Body Finish

Clear anodized

Shock Body Material

Aluminum

Shocks Included

Yes

Spring Finish

Silver powdercoated

Spring Rate (lbs/in)

175-350 lbs./in.

Suspension Height Adjustment

Stock

Upper Mount

Eyelet

Variable Rate Springs

1551-1850 lbs (12-175/350 Springs)

Welding Required

Yes

Prop 65

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

Title

QA1 Shock Absorber and Coil Spring Assembly ALN4000K

Easy and quick

Great customer service. Fast shipping. The products provided are good quality.

It was quick and easy

Autoplicity was quick, and fast! the shipping was standard but arrived in five days! I would definetly recommend them!

Great price for the product, fast shipping...Completely amazed by this seller. The rack was delivered to my door step in just a few days and the price was unbeatable. I'm really satisfied by the service and happy to have finally found a bike rack worth having!!!

Great prices and prompt shipping

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