QA1 GD401-10550A Front Double Adjustable Pro Coil Coilover System GM 550 lb/in Aluminum

(1967-1969 Chevrolet Camaro; 1968-1974 Chevrolet Nova; 1968-1974 Chevrolet Chevy II; 1967-1969 Pontiac Firebird; 1971-1974 Pontiac Ventura + 2 more models)

Manufacturer

Part Number

GD401-10550A

7 reviews

Sale Price

$964.95

Estimated ship date Monday, November 23

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Show details for QA1 GD401-10550A Front Double Adjustable Pro Coil Coilover System GM 550 lb/in Aluminum

Picture of QA1 GD401-10550A Front Double Adjustable Pro Coil Coilover System GM 550 lb/in Aluminum

QA1 GD401-10550A Front Double Adjustable Pro Coil Coilover System GM 550 lb/in Aluminum — image 1

QA1 GD401-10550A Front Double Adjustable Pro Coil Coilover System GM 550 lb/in Aluminum — image 2

QA1 GD401-10550A Front Double Adjustable Pro Coil Coilover System GM 550 lb/in Aluminum — image 3

QA1 GD401-10550A Front Double Adjustable Pro Coil Coilover System GM 550 lb/in Aluminum — image 4

QA1 GD401-10550A Front Double Adjustable Pro Coil Coilover System GM 550 lb/in Aluminum — image 5

Product Details

The QA1 GD401-10550A GM Pro Coil System is a front double-adjustable coilover kit built for drivers who demand precise, tunable suspension performance on the street or track. Featuring lightweight billet aluminum construction and a fully threaded shock body, this system delivers full control over both ride height and valving to suit any driving style.

Independent compression and rebound adjustment is handled via two separate 18-position knobs, providing up to 324 unique valving combinations for the ultimate in suspension fine-tuning. The adjustment knob is easily accessible by turning the steering wheel to full lock and reaching in at the base of the shock — no special tools required.

The included high-travel, tapered pigtail coil springs are specially engineered for QA1's Pro Coil Systems. American-made with fewer coils and a reduced wire diameter, they provide greater travel, reduced unsprung weight, and faster response compared to standard coil springs. This kit includes a 550 lb/in spring rate, designed for a recommended front end weight of 2,101–2,300 lbs. The kit bolts directly in using OE stamped steel control arms or QA1 tubular control arms.

Key Specifications:

Spring Rate: 550 lb/in
Recommended Front End Weight: 2,101–2,300 lbs
Compressed Height: 9.0 in
Extended Height: 12.8 in
Upper Mount: Stud
Lower Mount: T-Bar
Spring Style: Tapered Pigtail, 10 in
Shock Body: Lightweight Billet Aluminum
Adjustability: Double Adjustable — Independent Compression & Rebound (18 positions each)
Sold: In Pairs

Key Features:

Fully threaded body for precise ride height adjustment
324 valving combinations via dual 18-position adjustment knobs
USA-made high-travel tapered pigtail coil springs
Bolt-in installation compatible with OE or QA1 tubular control arms
100% dyno tested and serialized
Serviceable and rebuildable by QA1 Authorized Service Centers
Eligible for QA1 Limited Lifetime Warranty
Made in the USA (Lakeville, Minnesota)

Suited for drag racing, street performance, autocross, road racing, and street rod builds, the QA1 GD401-10550A is a proven coilover solution for classic GM F-body, X-body, and other A/G-body platforms.

Products specifications

Fits

1967-1969 Chevrolet Camaro; 1968-1974 Chevrolet Nova; 1968-1974 Chevrolet Chevy II; 1967-1969 Pontiac Firebird; 1971-1974 Pontiac Ventura; 1973-1974 Oldsmobile Omega; 1973-1974 Buick Apollo

Adjustable Mounting Bracket Included

Adjustable Valving

Yes

Coil-Over Kit Position

Front

Coil-Over Springs Included

Yes

Collapsed Length (in)

10.130 in.

Compressed Height

Crossmember Included

Extended Height

12.8

Extended Length (in)

14.000 in.

Gas Charged

Internal Design

Twin-tube

Lower Mount

Bar pin

Notes

Double adjustable coil-overs, designed to fit applications with big block engines. Shocks are remote ready, they can be used with the QA1 two or four channel remote adjustable system.

Number of Valving Selections

324

Quantity

Sold as a kit.

Recommended Front-End Weight

2,101-2,300 lbs.

Ref No

Shock Body Finish

Clear anodized

Shock Body Material

Aluminum

Shocks Included

Yes

Spring Finish

Silver powdercoated

Spring Rate (lbs/in)

550 lbs./in.

Suspension Height Adjustment

0.0-2.0 in. lowered front

Threaded Adjustment Range

3.000 in.

Upper Mount

Stud

Welding Required

Title

QA1 Shock Absorber and Coil Spring Assembly GD401-10550A

Prop 65

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

Fast Shipping. Good packaging. Very good pricing. Will shop from again.

mim1979

Great price and received item in a timely and in great condition. Will definitely shop here again!

Angelito

thanks

steve

After searching for the best prices for the product that I wanted, I ended up with Autoplicity. I quickly got a response that my product has just been shipped and I am very impressed that Autoplicity is giving me an incentive to write a review on them. This tells me that this company is very concerned with the satisfaction of their customers. I am currently waiting for the order to arrive, but so far, I am extremely confident and happy with Autoplicity!

MYKE-O

Customer Care took care of my return and refunded the shipping after there was some order confusion. Thank you for taking care of everything!

VikingOG

Wow that was fast. I ordered a Pertronix Ignitor conversion kit. Not only were they by far the lowest price I could find, they shipped within hours of submitting the order. I got the shipment in less than 24 hrs, even though I ordered ground shipping. I was a little bummed that they did not offer free shipping, as I am used to with other online places, but with their fast turnaround, I am not begrudging it. Sure it might have been because they have a warehouse nearby, but it was still unexpectedly impressive. The part arrived and looks like it all there and should be good to go. <br><br>I can't vouch for their customer service, but so far I am pleasantly surprised.

Thesparrow

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shotfritz

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