Description

QA1 MOD Series coilover conversion systems put the ability to re-valve your shocks—on your car—into the palm of your hand. These innovative shocks feature QuickTune Technology, an industry-first that provides the ability to adapt to any track, any conditions, any time. The technology consists of interchangeable, dry modular valve pack assemblies, that can be thought of as dozens of finely tuned shocks you can hold in the palm of your hand. They define the valving curve of the shocks, and can be changed without interrupting the oil pathways. Simply unscrew from the shock, bolt-in another one with a new pre-determined valving range—and you're ready to go. There's no mess, no contamination, no air intrusion, and no downtime waiting on someone to re-valve your shocks. Ideal for Circle Track and Street/Strip applications, the shocks are available in a variety of extended and collapsed length models to best fit your vehicle. You get everything you need with these QA1 Rear MOD systems, from shocks to nuts and bolts, complete installation instructions, and even decals!

Additional benefits and features of QA1 MOD Series shocks:

* All new design delivers force, control, and unmatched tenability
* Hard anodized aluminum bodies with PTFE—durable, non-galling surface
* Double-adjustable shocks with low-speed bleed adjustments
* Large solid piston (with blow-off valve)—improved driver feel and control with up to 1,600 lb. force
* High-speed valving adjustment (coarse adjustment)—relates to shock operation during impact events, like hitting a pothole or curb
* 24 clicks/settings—wider range of adjustment than comparable shocks
* Indexable base eyelet—multiple mounting position to optimize knob access and provide more mounting flexibility
* Low-speed valving (fine-tune adjustments)—adjusts ride quality and weight transfer on corner entry/exit; more bleed for softer feel and less bleed for stiffer feel
* Piggyback or remote canister options
* Unique spring adjuster nut and tool
* Thrust bearings included
* Superior thermal performance, as oil is in constant contact with outer body
* One base shock can be upgraded over time to keep up with increased performance levels of your vehicle

Product Overview

soft or firm compression and rebound valve packs also available. Once the desired valving is in place, the unique double adjustable design, with adjustable low-speed bleed, allows for fully independent control over the compression and rebound characteristics. With all these adjustability options, the MOD Series shock achieves an expansive force curve capability and an unprecedented level of tunability. The shock also features mounting adjustability to accommodate a variety of vehicles and mounting configurations. The nitrogen-charged canister is available in a piggyback or remote configuration for ease of installation in tight areas, and the base eyelet is indexable, so you can unbolt it and reattach it at the angle you need for the best shock and canister placement. Like all QA1 shocks, the MOD Series shock is 100% dyno tested and serialized and proudly made in QA1's Lakeville, Minnesota facility.

Features and Benefits

• Achieve 1/2 higher than stock down to 2.25" lower than stock.
• Ultimate balance of ride quality and performance handling with adjustable rebound and compression valving.
• Limited Lifetime Warranty for peace of mind.
• Sold as a pair.
• Proudly 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 64-72 GM A/G-Body Pro Rear Coil-Over System - MOD Series - 12in x 150lbs/in - Aluminum
Grade Type:	Performance
Internal Construction Type:	Dual Tube
Manufacturer Part Number:	RCK52441
Part Number:	qapRCK52441
Prop 65 - Short Label:	WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov
Prop 65 Yes/No:	Yes
Remote Reservoir:	Yes
Spring Color:	Silver
Spring Material:	High Tensile Chrome Silicon
Title:	QA1 Shock Absorber and Coil Spring Assembly RCK52441
UPC:	806990155030

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
	qapHK23-GMG2	QA1 69-72 GM G-Body Level 3 Handling Kit 2.0 w/ Shocks (1x qap5205, 1x qap5248, 1x qap52522, 1x qap52537, 1x qap5284, 1x qap52870, 1x qap52871, 1x qap9039-308, 1x qapMG401-10550B, 1x qapRCK52441, 1x qapT121W)

Data: v4.2 - Upd: 2026-10-15 16:42:25

Features

Specifications

Product Attributes - Brand

QA1

Product Attributes - Manufacturer's Part Number

RCK52441

Product Attributes - Part Type

Coilover Kits

Product Attributes - Product Line

QA1 Rear MOD Coilover Conversion Systems

Product Attributes - UPC

806990155030

Product Attributes - Coilover Kit Position

Rear

Product Attributes - Adjustable Valving

Yes

Product Attributes - Number of Valving Selections

324

Product Attributes - Shocks Included

Yes

Product Attributes - Internal Design

Twin-tube

Product Attributes - Coilover Springs Included

Yes

Product Attributes - Spring Rate (lbs./in.)

150 lbs./in.

Product Attributes - Suspension Height Adjustment

0.0-1.5 in. lowered

Product Attributes - Gas Charged

Yes

Product Attributes - Extended Length (in.)

20.50

Product Attributes - Collapsed Length (in.)

14.00

Product Attributes - Upper Mount

Eyelet

Product Attributes - Lower Mount

Eyelet

Product Attributes - Body Diameter (in.)

2.000

Product Attributes - Shock Body Material

Aluminum

Product Attributes - Shock Body Finish

Black/Red

Product Attributes - Bushing Material

Spherical bearing

Product Attributes - Bushing Color

Black

Product Attributes - Spring Finish

Gray/Silver

Product Attributes - Crossmember Included

No

Product Attributes - Adjustable Mounting Bracket Included

Yes

Product Attributes - Hardware Included

Yes

Product Attributes - Welding Required

No

Product Attributes - Quantity

Sold as a kit.

Product Attributes - Notes

Double adjustable coilovers. Includes 2 springs and 2 coilover shocks with necessary hardware. The base eyelet is indexable, so you can unbolt and reattach at the angle you need for the best shock and canister placement.

Compatibility