QA1 GM Pro Front Double Adjustable Coilover System 9 Inch 550 lb Spring

Adjustable GM Front Suspension Performance

The QA1 GD507-09550D GM Pro front coil-over system delivers adjustable ride height and independent compression and rebound control for GM performance applications. Its 9-inch, 550 lb/in high-travel springs and lightweight aluminum shocks support street performance, autocross, road racing, drag racing, and street rod use.

Key Features

• GD507-09550D front system with double-adjustable shock control
• Double-adjustable front coil-over shock system
• Independent compression and rebound adjustment
• 18-position adjustment knob
• 9-inch high-travel coil springs with a 550 lb/in spring rate
• Fully threaded shock bodies for ride height adjustment
• 0 to -2 inches of ride-height adjustment through the spring-seat nut
• Bolt-in design with no drilling required according to the listed installation information
• Compatible with OE stamped-steel control arms or QA1 tubular control arms
• Lightweight billet aluminum coil-over shocks
• 100% dyno tested and serialized
• Serviceable and rebuildable by QA1 authorized service centers
• Made in the USA
• Sold in pairs

Fitment

This front system is listed for the GM applications below. Confirm the specific vehicle, suspension configuration, and control arm compatibility before installation.

Vehicle application	Years	Position and notes
Chevrolet Corvette C2 and C3	1963-1982	Front coil-over system
GM Camaro	Not specified	Front coil-over system
Pontiac Firebird	Not specified	Front coil-over system
Chevrolet Nova	Not specified	Front coil-over system
GM A-Body	1964-1972	Front coil-over system
GM A-Body	1973-1977	Front coil-over system
GM A/G-Body	1978-1988	Front coil-over system
GM F-Body	1967-1969	Front coil-over system
GM F-Body	1970-1981	Front coil-over system
GM X-Body	1968-1974	Front coil-over system
Chevrolet S-Series Pickup	1982-2004	Front coil-over system
Chevrolet Sedan	1955-1957	Front coil-over system
Chevrolet B-Body	1958-1970	Front coil-over system
GM B-Body	1971-1976	Front coil-over system
GM B-Body	1977-1990	Front coil-over system
GM B-Body	1991-1996	Front coil-over system
Chevrolet C10	1963-1987	Front coil-over system
Chevrolet C1500	1988-1998	Front coil-over system
Buick Riviera	1963-1965	Front coil-over system

Specifications

Detail	Value
Part number	GD507-09550D
Product type	Front coil-over shock system
Shock adjustment	Double adjustable with independent compression and rebound control
Adjustment positions	18 positions
Spring length	9 inches
Spring rate	550 lb/in
Ride height adjustment	0 to -2 inches with the spring-seat nut
Additional lowering	Drop spindles can provide additional drop beyond 2 inches
Installation style	Bolt-in
Control arm compatibility	OE stamped-steel control arms or QA1 tubular control arms
Shock construction	Lightweight billet aluminum
Spring construction	American-made lightweight high-travel springs
Testing	100% dyno tested and serialized
Service	Serviceable and rebuildable by QA1 authorized service centers
Manufacturing	Made in the USA

What's Included

• One QA1 GD507-09550D front Pro-Coil system
• Coil springs

About QA1

QA1 develops adjustable suspension components for street performance, autocross, road racing, drag racing, and street rod applications. The QA1 GD507-09550D system is built around lightweight billet aluminum shocks, high-travel springs, adjustable ride height, and serviceable shock construction. QA1 products are dyno tested and serialized, and the company supports service and rebuilding through authorized service centers.

FAQ

What is the GD507-09550D?

It is a QA1 GM Pro front double-adjustable coil-over shock system with a 9-inch spring and a 550 lb/in spring rate.

What does double adjustable mean?

The shock provides separate compression and rebound adjustment for more precise suspension tuning.

How many adjustment positions are available?

The shock has an 18-position adjustment knob.

What spring rate does this system use?

It uses a 550 lb/in high-travel coil spring.

How much ride-height adjustment is available?

The spring-seat nut provides 0 to -2 inches of ride-height adjustment.

Can the vehicle be lowered more than 2 inches?

Drop spindles can provide additional drop beyond 2 inches.

Which control arms can be used?

The system is compatible with OE stamped-steel control arms or QA1 tubular control arms.

Is this a bolt-in installation?

Yes. The listed installation information describes a bolt-in design with no drilling required.

Installation Instructions

1. Verify that the vehicle matches a listed GM application and confirm compatibility with the existing suspension configuration.
2. Use the system with the existing OE stamped-steel control arms or QA1 tubular control arms.
3. Install the front coil-over system in the factory suspension location as a bolt-in assembly. No drilling is required according to the listed installation information.
4. Use a QA1 T114W or T115W spanner wrench to adjust the spring-seat nut. The required spanner wrench is not stated as included.
5. Set the spring-seat nut to establish the desired ride height within the 0 to -2 inch adjustment range.
6. For more than 2 inches of additional drop, use compatible drop spindles.
7. Turn the steering wheel to full lock to access the shock adjustment knob at the shock base.
8. Set compression and rebound using the 18-position adjustment knob, then test the vehicle and refine the settings for the intended driving conditions.
9. Inspect all installed components and confirm that the suspension moves freely before driving.

Prop 65 Warning

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.