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Qa1

QA1 GM Pro Front Coil-Over System - Single Adj. - 10in x 400lbs/in - Pigtail - Aluminum

SKU: QAPGS501-10400A

Coilover Kits

QAP Coil-Overs - Pro Coil...

Qa1

QA1 GM Pro Front Coil-Over System - Single Adj. - 10in x 400lbs/in - Pigtail - Aluminum

SKU: QAPGS501-10400A

Coilover Kits

QAP Coil-Overs - Pro Coil...

A$1,925.47
IN STOCK! Est Ship 4-7 days. This item is IN STOCK at one of our warehouses or distribution centres, the ETA is the approximate time required to prepare your order for dispatch.
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Description

IMPORTANT NOTICE: Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.Reference Information Reference Data (Provide these details to our support team) Brand Name/s Qa1 StreetFX SKU qapGS501-10400A SFX Item ID 4093659 Accounting SKU qap-GS501-10400A Manufacturer SKU GS501-10400A Manufacturer UPC 806990062642 Alternative References GS501-10400A, QA1-GS501-10400A, QA1GS501-10400A

Coil-Over Shock Kit - Pro Coil - Twintube - Single Adjustable - 400 lb/in Spring Rate - Front - 1801-1900 lb - GM F-Body 1970-81 - Pair

QA1 GM Pro Front Coil-Over System - Single Adj. - 10in x 400lbs/in - Pigtail - Aluminum

Additional Information

Front Pro Coil single adjustable stock mount shock kit. Compressed length of 10.13" and extended length of 17". Includes 10" spring with rating of 400 and has a tapered pigtail end.

Part Type

Coilover Set

Features and Benefits

  • Adjustable shock valving options for all driving styles
  • Best-in-class warranty
  • Easy bolt-in install
  • Made in the USA
  • QA1 uniquely engineered to enhance the performance of your vehicle
  • Ride height adjustability

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 - Single Adj. - 10in x 400lbs/in - Pigtail - Aluminum
Grade Type:Performance
Internal Construction Type:Dual Tube
Manufacturer Part Number:GS501-10400A
Part Number:qapGS501-10400A
Remote Reservoir:No
Spring Color:Silver
Spring Material:High Tensile Chrome Silicon
Title:QA1 Coilover Spring and Shock Assembly GS501-10400A
UPC:806990062642

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

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
qapHK21-GMA1 QA1 64-67 GM A-Body Level 1 Handling Kit 2.0 w/ Shocks (1x qap5250, 1x qap52870, 2x qap7888-109, 1x qapGS501-10400A, 1x qapRCK52340, 1x qapT114W)

Product Downloads

# Document Type Download
1. Installation Instructions

Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.

Data: v2 - Desc: v4.2 - Upd: 2026-10-15 15:39:18

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

  • QA1 uniquely engineered to enhance the performance of your vehicle
  • Ride height adjustability
  • Adjustable shock valving options for all driving styles
  • Easy bolt-in install
  • Best-in-class warranty
  • 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 - Single Adj. - 10in x 400lbs/in - Pigtail - Aluminum
Grade Type:Performance
Internal Construction Type:Dual Tube
Manufacturer Part Number:GS501-10400A
Part Number:qapGS501-10400A
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 Coilover Spring and Shock Assembly GS501-10400A
UPC:806990062642

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
qapHK21-GMA1 QA1 64-67 GM A-Body Level 1 Handling Kit 2.0 w/ Shocks (1x qap5250, 1x qap52870, 2x qap7888-109, 1x qapGS501-10400A, 1x qapRCK52340, 1x qapT114W)

Part Type

Coilover Set

Data: v4.2 - Upd: 2026-10-15 15:15:48

Features

  • Adjustable shock valving options for all driving styles
  • Best-in-class warranty
  • Easy bolt-in install
  • Made in the USA
  • QA1 uniquely engineered to enhance the performance of your vehicle
  • Ride height adjustability

Specifications

Coilover Kit, Pro Coilover System, Front, Single Adjustable, Buick, Chevy, Oldsmobile, Pontiac, Pair

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 Attributes
BrandQA1
Manufacturer's Part NumberGS501-10400A
Part TypeCoilover Kits
Product LineQA1 Pro Coilover Systems
UPC806990062642
Coilover Kit PositionFront
Adjustable ValvingYes
Number of Valving Selections18
Shocks IncludedYes
Internal DesignTwin-tube
Coilover Springs IncludedYes
Spring Rate (lbs./in.)400 lbs./in.
Suspension Height Adjustment0.0-2.0 in. lowered
Recommended Front-End Weight1,801-1,900 lbs
Gas ChargedNo
Extended Length (in.)17.00
Collapsed Length (in.)10.13
Threaded Adjustment Range3.000 in.
Upper MountStud
Lower MountBar pin
Shock Body MaterialAluminum
Shock Body FinishSilver
Bushing MaterialPolyurethane
Bushing ColorBlack
Spring FinishGray/Silver
Crossmember IncludedNo
Adjustable Mounting Bracket IncludedNo
Hardware IncludedYes
Welding RequiredNo
QuantitySold as a pair.
NotesDesigned to fit applications with small block engines. Coilover shocks are single adjustable Pro series GS501 shocks. Springs are 10 in. tapered with a pigtail upper end style 10HTSP400 springs.

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 - Single Adj. - 10in x 400lbs/in - Pigtail - Aluminum
Grade Type:Performance
Internal Construction Type:Dual Tube
Manufacturer Part Number:GS501-10400A
Part Number:qapGS501-10400A
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 Coilover Spring and Shock Assembly GS501-10400A
UPC:806990062642

Reference Information

Brand Name/s Qa1
StreetFX SKU qapGS501-10400A
SFX Item ID 4093659
Supplier Item Code 4093659
Manufacturer SKU GS501-10400A
Manufacturer UPC 806990062642
Alternative References qa1, QA1GS501-10400A, 10in, 400lbs/in

Brochures

Compatibility

QA1 GM Pro Front Coil-Over System - Single Adj. - 10in x 400lbs/in - Pigtail - Aluminum
Year RangeMakeModelSubmodelsRegion
1965-1967 Buick Gran Sport Base US
1964-1967 Buick Skylark Base US
1964-1967 Buick Special Base, Deluxe US
1956-1957 Chevrolet Bel Air Base, Nomad, Beauville US
1964-1967 Chevrolet Chevelle 300, Malibu, Malibu Super Sport, 300 Deluxe, Super Sport 396, Concours, SS 396 US
1964-1967 Chevrolet El Camino Base US
1955-1957 Chevrolet Truck 3100, 3200, 3400, 3500, 3600, 3700, 3800, Base US
1955-1957 Chevrolet Two-Ten Series Base, Del Ray US
1964-1967 Oldsmobile 442 Base US
1964-1967 Oldsmobile Cutlass Base, Holiday, Turnpike Cruiser US
1964-1967 Oldsmobile Vista Cruiser Base, Custom US
1964-1967 Pontiac GTO Base US
1964-1967 Pontiac LeMans Base US
1964-1967 Pontiac Tempest Base, Custom, Safari US

Please note that this information serves as a fitment guide only. For specific fitment questions or clarifications, please contact us, as manufacturers may introduce variations and modifications during model year or regional revisions. While we strive to provide accurate data, fitment details may vary by region; therefore, compatibility outside the listed region and submodel variant cannot be guaranteed.

Detailed Compatibility


Application Data
MakeBUICK
ModelGRAN SPORT
SubmodelBASE
Beginning Year1965
Ending Year1966
Engine TypeV8
CC6572
CID401
Liter6.6
Engine Size6.6L/401
Engine FamilyBuick V8
DrivetrainRWD
MakeBUICK
ModelGRAN SPORT
SubmodelBASE
Beginning Year1967
Ending Year1967
Engine TypeV8
CC5573
CID340
Liter5.6
Engine Size5.6L/340
Engine FamilyBuick V8
DrivetrainRWD
MakeBUICK
ModelGRAN SPORT
SubmodelBASE
Beginning Year1967
Ending Year1967
Engine TypeV8
CC6555
CID400
Liter6.6
Engine Size6.6L/400
Engine FamilyBuick V8
DrivetrainRWD

This may not be an exhaustive list of compatible vehicles. Please reach out to one of our representatives if you are unsure or do not see your vehicle here.

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