Description

IMPORTANT NOTICE: Will not fit Cobra Independent Rear Suspension(IRS).

As part of the number one choice for custom suspension systems, QA1 Proma Star single adjustable coilover systems are available in several lengths, making them easy to fit in almost any situation. Both the double-adjustable versions and these single-adjustable models allow you to set your valving to fit your driving style, so you are ready to hit the road, nearest racetrack, or anywhere in between. Get that perfect stance with adjustable ride height when you order the QA1 Proma Star single adjustable coilover systems best suited for your application.

Other product features include:

* On-the-car adjustable valving makes it quick and easy to dial in your desired level of comfort and performance
* Shocks feature a 2 in. body diameter and can be mounted in any orientation
* Spring mounting hardware designed for coil springs with a 2 1/2 in. inside diameter
* Alternative mounting options available to fit your custom chassis
* 100-percent dyno tested and serialized
* QA1 single-adjustable shocks are designed for performance street driving, autocross, and lower-powered drag racing (rear only)
* All QA1 single-adjustable shocks feature simultaneous compression and rebound adjustment on one knob (18 positions)

Product Overview

Product Overview Improve your Mustang's suspension with QA1's bolt-in rear coil-over conversion kit. This kit includes specially designed mounting brackets, adjustable aluminum shocks, springs, and all necessary hardware. Ride Height Adjustability We understand that achieving the perfect stance for your car can be a challenge. That's why we've created a solution that makes it easy to adjust your ride height. QA1 coilovers feature a fully threaded, aluminum body which allows up-to 2 of lowering from stock. Single-Adjustable Coil-Overs QA1's 18-way adjustable single-adjustable shocks are tailored for street-driven cars that also hit the track. With a simple turn of the knob, you can adjust your shocks for a comfortable ride or a more aggressive valving, depending on your needs. Easy, Bolt-In Installation Our commitment to thoughtful product design is evident in every product we produce, to deliver the highest level of performance, while ensuring trouble-free compatibility. Best In-Class Lifetime Warranty Register at QA1.net/warranty for lifetime coverage of your QA1 shocks. Made in the USA QA1 coilovers are proudly made in Lakeville, Minnesota. Fitment Notes Does not fit Cobra IRS

Features and Benefits

• QA1 uniquely engineered to enhance the performance of your vehicle
• Ride height adjustability
• Adjustable shock valving options for all driving styles
• Easy bolt-in install
• Best-in-class warranty
• Made in the USA

Product Details

Active or Passive Suspension:	Passive
Adjustable Compression:	Yes
Adjustable Rebound:	Yes
Adjustable Ride Height:	Yes
Assembled:	No
Brand:	QA1
Description:	QA1 79-04 Ford Mustang 12-130 Kit Rear Pro-Coil S-Adj
Grade Type:	Performance
Internal Construction Type:	Dual Tube
Manufacturer Part Number:	RCK52402
Part Number:	qapRCK52402
Prop 65 - Short Label:	WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov
Prop 65 Yes/No:	Yes
Remote Reservoir:	No
Spring Color:	Black
Spring Material:	High Tensile Chrome Silicon
Title:	QA1 Coilover Spring and Shock Assembly RCK52402
UPC:	806990174475

Kit Options

This item is available as a full kit.
Select a kit option in the following table if you are looking for this item in a bundle form with all associated components.

Kit option/s:

Thumb	SKU	Kit Title
	qapHK41-FMM1	QA1 79-86 Ford Mustang Level 1 Handling Kit w/ Shocks (1x qap52891, 1x qapHS01-12200, 1x qapRCK52402)
	qapHK41-FMM2	QA1 87-89 Ford Mustang Level 1 Handling Kit w/ Shocks (1x qap52891, 1x qapHS01-12200, 1x qapRCK52402)
	qapHK41-FMM3	QA1 90-93 Ford Mustang Level 1 Handling Kit w/ Shocks (1x qap52891, 1x qapHS02-12200, 1x qapRCK52402)
	qapHK41-FMM4	QA1 94-04 Ford Mustang Level 1 Handling Kit w/ Shocks (1x qap52884, 1x qapHS03-12200, 1x qapRCK52402)

Data: v4.2 - Upd: 2026-10-02 23:54:21

Features

Specifications

Product Attributes - Brand

QA1

Product Attributes - Manufacturer's Part Number

RCK52402

Product Attributes - Part Type

Coilover Kits

Product Attributes - Product Line

QA1 Proma Star Single Adjustable Coilover Systems

Product Attributes - UPC

806990174475

Product Attributes - Coilover Kit Position

Rear

Product Attributes - Adjustable Valving

Yes

Product Attributes - Number of Valving Selections

18

Product Attributes - Shocks Included

Yes

Product Attributes - Internal Design

Twin-tube

Product Attributes - Coilover Springs Included

Yes

Product Attributes - Spring Rate (lbs/in.)

130 lbs./in.

Product Attributes - Suspension Height Adjustment

0.0-2.0 in. lowered

Product Attributes - Gas Charged

No

Product Attributes - Extended Length (in.)

16.88

Product Attributes - Collapsed Length (in.)

11.63

Product Attributes - Upper Mount

Eyelet

Product Attributes - Lower Mount

Eyelet

Product Attributes - Shock Body Material

Aluminum

Product Attributes - Shock Body Finish

Silver

Product Attributes - Bushing Material

Polyurethane

Product Attributes - Bushing Color

Black

Product Attributes - Spring Finish

Black

Product Attributes - Crossmember Included

No

Product Attributes - Adjustable Mounting Bracket Included

No

Product Attributes - Hardware Included

Yes

Product Attributes - Welding Required

No

Product Attributes - Quantity

Sold as a pair.

Product Attributes - Notes

Will not fit Cobra Independent Rear Suspension(IRS).

Compatibility