Skip to Product Info
    • GM_PROCOIL_SINGLE.jpg
    • Prop 65 Warning.png
    • QA1 Logo_Standard.jpg

    QA1 Kit GM Pro Coil Alum S-Adj 10-550 Tapered Flat GS401-10550B

    Vendor: QA1
    Part Number: GS401-10550B
    Regular Price $789.95

    Available to order. In-stock orders typically ship in 1 to 2 business days.

    Not sure it fits your vehicle?
    Email sales@berryperformancesales.com with your year, make, model and engine, and we'll help you check fitment before you order.
    Fast Fulfillment: In-stock orders typically ship within 1 to 2 business days.
    Free Shipping on Orders Over $99 | Excludes freight shipments
    International Shipping Available: email sales@berryperformancesales.com for a quote.
    Payment & Security

    Secure, encrypted checkout. Card details go straight to the payment processor and are never stored by us.

    • Amazon
    • Amazon
    • American Express
    • Apple Pay
    • Diners Club
    • Discover
    • Google Pay
    • Mastercard
    • PayPal
    • Shop Pay
    • Venmo
    • Visa
    Share to:
    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


    QA1 Kit GM Pro Coil Alum S-Adj 10-550 Tapered Flat GS401-10550B


    Specifications:

    California Proposition 65 WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov
    Title QA1 Coilover Spring and Shock Assembly GS401-10550B
    Description_MKT 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
    Description_SHO Pro Coil Shock Kit
    Description_INV QA1 Pro Coil Shock Kit
    Description_DEF Coilover Spring and Shock Assembly
    Description_ASC 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
    Description_DES Kit GM Pro Coil Alum S-Adj 10-550 Tapered Flat
    Description_EXT Front Pro Coil single adjustable stock mount shock kit. Compressed length of 10.13" and extended length of 14". Includes 10" spring with rating of 550 and has a tapered flat end.


    This Part Fits:

    Year Make Model Submodel Notes
    1968 Buick Skylark
    1969 Buick Skylark
    1970 Buick Skylark
    1971 Buick Skylark
    1972 Buick Skylark
    1968 Buick Special
    1969 Buick Special
    1968 Chevrolet Chevelle
    1969 Chevrolet Chevelle
    1970 Chevrolet Chevelle
    1971 Chevrolet Chevelle
    1972 Chevrolet Chevelle
    1968 Chevrolet El Camino
    1969 Chevrolet El Camino
    1970 Chevrolet El Camino
    1971 Chevrolet El Camino
    1972 Chevrolet El Camino
    1971 GMC Sprint
    1972 GMC Sprint
    1968 Oldsmobile 442
    1969 Oldsmobile 442
    1970 Oldsmobile 442
    1971 Oldsmobile 442
    1968 Oldsmobile Cutlass
    1969 Oldsmobile Cutlass
    1970 Oldsmobile Cutlass
    1971 Oldsmobile Cutlass
    1972 Oldsmobile Cutlass
    1968 Oldsmobile Vista Cruiser
    1969 Oldsmobile Vista Cruiser
    1970 Oldsmobile Vista Cruiser
    1971 Oldsmobile Vista Cruiser
    1972 Oldsmobile Vista Cruiser
    1968 Pontiac GTO
    1969 Pontiac GTO
    1970 Pontiac GTO
    1971 Pontiac GTO
    1972 Pontiac GTO
    1968 Pontiac LeMans
    1969 Pontiac LeMans
    1970 Pontiac LeMans
    1971 Pontiac LeMans
    1972 Pontiac LeMans
    1968 Pontiac Tempest
    1969 Pontiac Tempest
    1970 Pontiac Tempest
    Shipping Policy
    • Free shipping on orders over $99 (excludes freight shipments).
    • In-stock orders typically ship within 1 to 2 business days. Weekend and holiday orders are processed the next business day.
    • Orders ship from Defiance, Ohio and a nationwide network of warehouses and manufacturers.
    • Items showing an ETA are not in stock yet. ETAs come from the manufacturer and can change.
    • No P.O. Boxes. International orders need a shipping quote, so email us first.

    Read the full Shipping Policy

    Return Policy
    • 30-day return window from the ship date. Returns must be approved first; email sales@berryperformancesales.com with your order number.
    • Items must be unused, complete and in the original packaging.
    • A 20% restocking fee applies, and return shipping is paid by the buyer.
    • Not returnable: installed or modified parts, opened or used programmers and tuners, custom orders, Open Box, and Clearance or Final Sale items.
    • Damaged, defective or incorrect items must be reported within 48 hours of delivery with photos.

    Read the full Return Policy

    Disclaimer

    All products are sold for off-road use only unless otherwise specified. Buyer assumes all responsibility for installation and operation. Seller is not liable for any incidental, indirect, or consequential damages — including engine failure, labor costs, or vehicle downtime — resulting from the use of any product sold.

    By making a purchase from Berry Performance Sales, you acknowledge and agree to abide by the terms and conditions of these Policies.

    For any questions or concerns, please contact us — we’re always happy to help.

    Recently Viewed