QA1 GS507-10750C Front Pro Coil Single Adj Coilover Kit Full Size GM 750 lb/in

Vehicle Fitment

• 1971-1996 Chevrolet Impala, Caprice, Bel Air (GM Full-Size / B-Body / C-Body)
• 1977-1993 Chevrolet Caprice, Impala (GM B-Body)
• 1971-1996 Buick LeSabre, Electra, Estate Wagon (GM Full-Size)
• 1971-1996 Oldsmobile Delta 88, 98, Custom Cruiser (GM Full-Size)
• 1971-1996 Pontiac Bonneville, Catalina, Parisienne (GM Full-Size)
• 1978-1988 GM G-Body (Monte Carlo, Malibu, El Camino, Regal, Cutlass, Grand Prix) - with compatible spring perch geometry
• Compatible Ford full-size vehicles and Galaxies with equivalent front suspension geometry

Fitment Notes

• Bolt-in compatible with both factory OE stamped steel control arms and QA1 tubular control arms - no control arm replacement required
• Upper mount: Stud type / Lower mount: Bar pin (T-bar type)
• Some applications may require the lower A-arm to be dropped for installation; shock body diameter may require enlarging the lower control arm shock opening
• Provides 0 to -2 inches of front ride height adjustability
• 750 lbs/in is the stiffest rate in the full-size GM Style C single adjustable Pro Coil lineup - recommended for the heaviest front axle weight builds; for lighter builds see the 450 lbs/in (GD507-10450C), 550 lbs/in (GS401-10550C), or 650 lbs/in (GS401-10650C) options; contact QA1 tech support for spring rate guidance based on your vehicle's front axle weight
• Spring style: 10-inch tapered Style C (large diameter flat upper) - specific to full-size GM spring perch geometry
• Register shocks at QA1 before installation to activate Limited Lifetime Warranty

Features

• Single adjustable GS507 Pro Coil shock - 18 valving positions of simultaneous compression and rebound adjustment for easy on-car tuning
• Provides 0 to -2 inches of front ride height adjustability via threaded shock body spring seat nut
• Includes a 10-inch tapered Style C high travel chrome silicon spring at 750 lbs/in - the stiffest standard rate for the heaviest full-size GM builds requiring maximum front spring support
• Fewer coils and smaller wire diameter vs. conventional springs for increased travel and reduced unsprung weight
• Bolt-in with both factory OE and QA1 tubular control arms for maximum build flexibility
• Stud upper / bar pin T-bar lower mount configuration for stock-style full-size GM front suspension integration
• Suitable for street performance, autocross, road racing, drag racing, and street rod applications
• 100% dyno-tested and serialized for verified, consistent performance
• Serviceable and rebuildable by QA1 Authorized Service Centers
• Made in the USA at QA1's Lakeville, Minnesota facility

Specifications

• Part Number: GS507-10750C
• Type: Front Pro Coil Single Adjustable Coilover System
• Application: 1971-1996 GM Full-Size / B-Body / C-Body; 1978-1988 GM G-Body; Compatible Ford Full-Size
• Shock Model: GS507 Single Adjustable Pro Coil
• Compressed Length: 9.63 inches
• Extended Length: 14.50 inches
• Threaded Adjustment Range: 3 inches
• Valving: 18 positions (simultaneous compression and rebound)
• Spring Length: 10 inches (tapered, Style C - large diameter flat upper)
• Spring Rate: 750 lbs/in
• Spring Material: Chrome Silicon High Travel
• Ride Height Adjustability: 0 to -2 inches
• Upper Mount: Stud Type
• Lower Mount: Bar Pin (T-Bar Type)
• Warranty: Limited Lifetime (register before installation)
• Quantity: Pair (2 shocks + 2 springs)
• Made in the USA

Included Components

• 2x QA1 GS507 Single Adjustable Pro Coil Front Shocks (100% Dyno-Tested and Serialized)
• 2x 10-Inch Tapered Style C High Travel Chrome Silicon Springs - 750 lbs/in
• 1x Complete Hardware Kit (all required mounting hardware)

Product Description

The QA1 GS507-10750C is a single adjustable front Pro Coil coilover system engineered as a bolt-in front suspension upgrade for 1971-1996 GM full-size vehicles - including the Impala, Caprice, Buick LeSabre, Oldsmobile 88, and Pontiac Bonneville - as well as compatible 1978-1988 GM G-Body applications and Ford full-size vehicles and Galaxies with equivalent front suspension geometry. The 750 lbs/in rate is the stiffest option in the full-size GM Style C single adjustable Pro Coil lineup, designed for the heaviest builds where lighter spring rates are insufficient to properly support the front axle weight.

This kit replaces the factory front coil spring and shock with an adjustable coilover assembly providing up to 2 inches of ride height drop. The 10-inch tapered Style C chrome silicon high travel spring seats against a large diameter flat upper end specific to the full-size GM spring perch geometry. The single adjustable GS507 shock offers an 18-position valve dial that adjusts compression and rebound simultaneously - accessible with the wheel turned to full lock. This kit installs with both factory OE stamped steel control arms and QA1 tubular control arms. Each shock is 100% dyno-tested, serialized, and serviceable by QA1 Authorized Service Centers. Register at QA1 before installation to activate the Limited Lifetime Warranty.