$113 Off

QA1 DD501-12300 HD Pro Rear Weld-In Coilover Kit, 300lb/in Spring

$113 Off

#721DD50112300

QA1 DD501-12300 HD Pro Rear Weld-In Coilover Kit, 300lb/in Spring

QA1's Heavy Duty Pro Rear Systems provide a seamless coilover conversion for vehicles with a 1700-2600 lbs. rear axle weight, including all necessary hardware for installation.
The system features axle-mounted brackets with 9” of total ride height adjustability in ¾” increments, allowing for precise stance control.

Spring Rate:

300 lb

$1,048.95

Factory Shipped

$1,162.06

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Product Summary

Rear Position, 300 lbs. Spring Rate, Height Adjustable

QA1's Heavy Duty Pro Rear Systems provide a seamless coilover conversion for vehicles with a 1700-2600 lbs. rear axle weight, including all necessary hardware for installation.
The system features axle-mounted brackets with 9” of total ride height adjustability in ¾” increments, allowing for precise stance control.
Double-adjustable Proma Star shocks offer independent rebound and compression tuning, making the system ideal for both street and race applications.
The kit is designed for easy weld-in installation with all essential components included, requiring minimal fabrication.
300lb/in. Spring for 3.00in. Axle Tube

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Key Specs

Position	Rear
Spring Rate	300 lbs.
Shock Adjustability	Double Adjustable
Shock Type	Twin Tube
Shock Body Material	Aluminum

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QA1 DD501-12300 Details

Product Overview QA1's Heavy Duty Pro Rear Systems are the perfect solution to add coilovers to your car or truck. Designed for any vehicle with a 1700-2600 lbs. rear axle weight, this kit includes all the necessary hardware and bracketry for a seamless installation. With double shear bracketry and increased spring rates, it ensures the strength and support you need for street and race applications. This simple weld-on kit features axle mount bracketry, upper shock mounts and tubing, and fully adjustable QA1 coilover shocks and springs. Ride Height Adjustability Our axle-mounted brackets offer ¾” increments of adjustment, and the coilover shock allows for fine-tuning. Combined, you will have a total of 9” of ride height adjustability, giving you full control for your desired stance. Double-Adjustable Coil-Overs For performance enthusiasts who demand precision handling and control, our double-adjustable Proma Star shocks are the perfect choice. Perfect for both street and track use, double adjustable shocks are famous for their independent rebound and compression tunability, giving you exceptional handling and control for finer control over your suspension. Easy, Weld-In Installation Each kit comes complete with the essential brackets, tabs, and hardware, making it a simple weld-on solution to get the job done efficiently without excess fabrication or trips to the parts store. Best In-Class Lifetime Warranty Register at QA1.net/warranty for lifetime coverage of your QA1 shocks. Made in the USA QA1’s Heavy Duty Pro-Rear Systems is proudly made in Lakeville, Minnesota. Fitment Notes Welding required Designed for 3.00” axle tubes Included tubular upper shock mount dimensions are 1-5/8” diameter x .095 wall, 40” long Requires use of QA1 spanner wrench T114W or T115W

Guides & Documents

Coilovers Installation Instructions (721DD50112300)

Warranty (QA1)

Technical Information (QA1)

WARNING:

Cancer and Reproductive Harm – www.P65Warnings.ca.gov

QA1 DD501-12300 Specifications

KEY SPECS
MFG. Part #	DD501-12300
Brand	QA1
Position	Rear
Spring Rate	300 lbs.
Shock Adjustability	Double Adjustable
Shock Type	Twin Tube
Shock Body Material	Aluminum
Upper Shock Mount	Eyelet
Lower Shock Mount	Bearing
Height Adjustable	Yes
Finish	Polished

GENERAL
Compressed Length	11.63"
Extended Length	16.88"
Number of Valving Selections	324
Coilover Springs Included	Yes
Sold in Quantity	Kit
Hardware Included	Yes
Crossmember Included	No
Welding Required	Yes
Gas Charged	No
Spring Finish	Powder Coated
Notes	Designed for 3.00 axle tubes. Included tubular upper shock mount dimensions are 1-5/8 diameter x .095 wall, 40 long. Requires use of QA1 spanner wrench T114W or T115W.
GTIN Code	806990169815
Adjustable Valving	Yes
Adjustable Mounting Bracket Included	Yes
Lower Mount	Bearing
Upper Mount	Bearing
Shocks Included	Yes

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