Description

QA1 Pro coilover systems are engineered from the ground up to offer unmatched performance over stock suspension setups. Pro coilover systems utilize adjustable and non-adjustable coilover shocks and springs designed specifically for replacing the factory shocks and springs. This combination offers ride height adjustment and variable position valving adjustment (where applicable) for performance not found in other kits. Choose QA1 Pro coilover systems for your next suspension upgrade.

Product Overview

These QA1 GM Pro Coil Systems are a great option for anyone looking for fully adjustable ride height and valving control. Choose a spring rate and adjustability that fits your driving style, adjust the valving to match and you are on your way. These shocks also utilize a fully threaded body that allows you to adjust your ride height for the perfect stance or to finely tune the weight balance for superior handling. Specially designed for QA1's Pro Coil Systems, the American-made lightweight high travel springs have fewer coils and a smaller wire diameter, resulting in increased travel due to the larger distance between the coils. They reduce unsprung weight and react faster, optimizing suspension performance. Multiple spring rate options are also available and have been successfully tested in various applications, from casual street driving to hard core race applications. Adjustable Pro Coil System Features: Available in independent compression and rebound double adjustable, simultaneous compression and rebound adjustable, or drag "R" Series adjustable, Lightweight Billet Aluminum Coil-Over Shocks, High Travel Springs, Easy, Bolt-In Installation, Ride Height Adjustable, 100% Dyno Tested and Serialized, Serviceable and Rebuildable by QA1 Authorized Service Centers, Made in the USA, Used in drag racing, street performance, autocross, road racing and street rod applications, Sold in Pairs, Non-Adjustable Pro Coil System Features: Steel, Stock Appearing Coil-Over Shocks, High Travel Springs, Easy, Bolt-In Installation, Ride Height Adjustable, Used in drag racing, street performance, autocross, road racing and street rod applications, Sold in Pairs

Features and Benefits

• Up to 2 of ride height adjustment allows you to dial in the perfect stance.
• Achieve the ultimate balance of ride quality and performance handling with independent tuning of rebound and compression valving.
• Easy bolt-in installation that works with your factory or upgraded QA1 tubular control arms.
• Limited Lifetime Warranty for peace of mind.
• 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 GM Pro Front Coil-Over System - Double Adj. - 10in x 550lbs/in - Flat - Aluminum
Grade Type:	Performance
Internal Construction Type:	Dual Tube
Manufacturer Part Number:	GD401-10550B
Part Number:	qapGD401-10550B
Prop 65 - Short Label:	WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov
Prop 65 Yes/No:	Yes
Remote Reservoir:	No
Spring Color:	Silver
Spring Material:	High Tensile Chrome Silicon
Title:	QA1 Shock Absorber and Coil Spring Assembly GD401-10550B
UPC:	806990062536

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
	qapHK22-GMG2	QA1 Level 2 Full Vehicle Handling Suspension Kits for 1969-1972 GRAND PRIX, 1970-1972 MONTE CARLO - HK22-GMG2 HANDLING KIT LEVEL 2, G-PRIX, MONTE; GM, 69-72 G-BODY, W/ SHOCKS

Data: v4.2 - Upd: 2026-10-08 16:38:16

Features

Specifications

Product Attributes - Brand

QA1

Product Attributes - Manufacturer's Part Number

GD401-10550B

Product Attributes - Part Type

Coilover Kits

Product Attributes - Product Line

QA1 Pro Coilover Systems

Product Attributes - UPC

806990062536

Product Attributes - Coilover Kit Position

Front

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.)

550 lbs./in.

Product Attributes - Suspension Height Adjustment

0.0-2.0 in. lowered

Product Attributes - Recommended Front-End Weight

2,101-2,200 lbs.

Product Attributes - Gas Charged

No

Product Attributes - Extended Length (in.)

12.88

Product Attributes - Collapsed Length (in.)

8.63

Product Attributes - Threaded Adjustment Range

3.000 in.

Product Attributes - Upper Mount

Stud

Product Attributes - Lower Mount

Bar pin

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

Gray/Silver

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

Designed to fit applications with big block engines. Coilover shocks are double adjustable Pro series GD401 shocks. Springs are 10 in. tapered with a flat upper end style 10HTSF550 springs.

Compatibility