Product Summary

Buick, Chevy, Oldsmobile, Pontiac, Front Position

    Key Specs

    Spring Rate350 lbs.
    Shock AdjustabilityDouble Adjustable
    Shock TypeTwin Tube
    Shock Body MaterialAluminum

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    QA1 MG401-10350B Details

    The QA1 GM Pro Coil System for 1968-1972 GM A-Body vehicles is 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:

    • MOD™ Series - independent compression and rebound double 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

    Additional MOD™ Series Features:

    • Features QuickTune™ technology - modular valve packs that allow for completely revalving the shock without having to remove it from the car!
      • Medium compression and rebound valve packs standard
      • Soft or firm compression and rebound valve packs also available
    • 24 click independent compression and rebound adjustment with low-speed bleed
    • Large solid piston (with blow-off valve) for improved driver feel and control with up to 1,600 lb. force
    • High-speed valving adjustment (coarse adjustment)—relates to shock operation during impact events, like hitting a pothole or curb 
    • Low-speed valving (fine-tune adjustments)—adjusts ride quality and weight transfer on corner entry/exit; more bleed for softer feel and less bleed for stiffer feel
    • Indexable base eyelet—multiple mounting position to optimize knob access and provide more mounting flexibility
    • Made to be used with bottom eyelet style mount in tubular control arms
    • Thrust bearings included


    The chart below is a general guideline for selecting spring rates for QA1's GM Front Pro Coil Shock Systems. Spring rates may vary depending on applications, usage, and personal preference.

    1500-1600 1601-1700 1701-1800 1801-1900 1901-2000 2001-2100 2101-2200 2201-2300 2301-2400
    250 300 350 400 450 500 550 600 650


    Not sure what your vehicle weighs? See our detailedwith Vehicle Weights for general guidelines on determining the approximate weight of popular vehicles.


    GS 1970 - 1972
    GS 350 1968 - 1969
    GS 400 1968 - 1969
    GS 455 1970 - 1972
    Skylark 1968 - 1972
    Special 1968 - 1969
    Sportwagon 1968 - 1969
    Chevelle 1968 - 1972
    El Camino 1968 - 1972
    Malibu 1964 - 1967
    442 1968 - 1971
    Cutlass 1968 - 1972
    F85 1968 - 1972
    Vista Cruiser 1968 - 1972
    GTO 1968 - 1972
    Tempest 1968 - 1970


    QA1 MG401-10350B Specifications

    MFG. Part #MG401-10350B
    Spring Rate350 lbs.
    Shock AdjustabilityDouble Adjustable
    Shock TypeTwin Tube
    Shock Body MaterialAluminum
    Upper Shock MountStud
    Lower Shock MountBushed Eyelet
    Shock Body SizeLarge Body
    Shock Body TypeThreaded
    Compressed Length Range8.00" to 8.99"
    Compressed Length8.63"
    Extended Length Range11.00" to 11.99"
    Extended Length11.63"
    Number of Valving Selections324
    Coilover Kit IncludedYes
    Coilover Springs IncludedYes
    Bushing MaterialRubber
    Body Diameter3"
    Sold in QuantityKit
    Hardware IncludedNo
    Crossmember IncludedNo
    Welding RequiredNo
    Gas ChargedNo
    Mounting Bracket IncludedNo
    Suspension Height Adjustment0.0-2.0 Inch Lowered
    Spring FinishPowder Coated
    Spring ColorSilver
    Recommended Front End Weight1,701-1,800 lbs.
    GTIN Code806990154385