Product Summary

Buick, Chevy, GMC, Oldsmobile, Pontiac, Powder Coated

    Key Specs

    MFG. Part #GBF015-2-B
    Bushing MaterialPolyurethane
    Spring Rate600 lbs.
    Front Coil Springs IncludedYes
    Rear Coil Springs IncludedYes

    Need To Know

    This Product Will Ship Free

    Shipping Policies & FAQs

    Quick and Easy Returns

    Return Policy

    UMI Performance GBF015-2-B Details

    UMI’s Stage 1.5 kit is the simple way to dramatically improve the handling and performance of your muscle car. We start with our original Stage 1 kit and take it to the next level by adding UMI’s new race-worthy rebound adjustable monotube shocks. The 20-click adjustment range covers street cruising, corner carving and even autocross or road course use. The Stage 1.5 kit also tunes up the camber curve by including ½” taller than stock upper ball joints that easily bolt to factory and most aftermarket a-arms. High performance lowering springs feature medium stiffness to control body movement and reduce floating while still providing a comfortable, sporty ride. The UMI rebound adjustable monotube shocks feature a large diameter piston and nitrogen charge to dampen bumps and provide a crisp feel without being harsh. The shock is built with heavy-duty mounts to ensure durability and fits in the stock location. They are easily adjustable with an external adjustment knob – no tools required. Stage 1.5 balances out with our tried and true 1.250” front sway bar and 1” rear sway bars reducing body roll and providing excellent chassis balance when handling at the limit. Every component in this kit, as with all UMI products, is Made in USA.

    ½” taller than stock upper ball joint to improve camber curve.

    Stage 1.5 can be upgraded to Stage 2 or 3 without duplicating parts

    Small Block and LS Note: Small block Chevrolet and Pontiac 400 tend to sit level with this kit. Lightweight LS may require spring trimming.

    Big block engines: An additional 1/4" front end drop may occur on vehicles with full weight big block engines.


    Race-proven rebound adjustable monotube shocks feature fixed medium compression and adjustable medium/high rebound for comfort combined with performance.

    Suitable for corner carving, auto-x and road racing while still being street friendly.

    Shocks are adjustable without tools, just turn the knob (20 clicks).

    1-1/4” CrMo front and 1” heat treated rear sway bars help control body roll.

    600lb/in linear front, 130lb/in linear rear lowering springs ensure crisp handling and a sporty ride

    UMI Performance GBF015-2-B Specifications

    MFG. Part #GBF015-2-B
    BrandUMI Performance
    Bushing MaterialPolyurethane
    Spring Rate600 lbs.
    Front Coil Springs IncludedYes
    Rear Coil Springs IncludedYes
    Rear Leaf Springs IncludedNo
    Front Shock Struts IncludedYes
    Front Shock TypeGas-charged Adjustable Monotube
    Rear Shock Struts IncludedYes
    Rear Shock TypeGas-charged Adjustable Monotube
    Front Sway Bar IncludedYes
    Front Sway Bar FinishPowder Coated
    Front Sway Bar TypeSolid
    Front Sway Bar Diameter1.25"
    Rear Sway Bar IncludedYes
    Rear Sway Bar FinishBlack powdercoated
    Rear Sway Bar TypeSolid
    Rear Sway Bar Diameter1"
    Tie Rod Sleeves IncludedNo
    End Link Bushings IncludedYes
    Rear Leaf Spring Bushings IncludedNo
    Sway Bar Bushings IncludedYes
    Upper Trailing Arms IncludedNo
    Lower Trailing Arms IncludedNo
    Trailing Arm Mount Braces IncludedNo
    Panhard Bar IncludedNo
    Torque Arm IncludedNo
    Upper Control Arms IncludedNo
    Lower Control Arms IncludedNo
    Front Strut Tower Bar IncludedNo
    K-Member Support Brace IncludedNo
    Rear Strut Tower Bar IncludedNo
    Subframe Connectors IncludedNo
    Chassis Stiffener IncludedNo
    Calipers IncludedNo
    Rotors IncludedNo
    Brake Pads IncludedNo
    Brake Lines IncludedNo
    Wheel Studs IncludedNo
    Center Link IncludedNo
    Spindles IncludedNo
    Inner Tie Rod Ends IncludedNo
    Outer Tie Rod Ends IncludedNo
    Front Suspension Height2.0 Inch Lowered
    Rear Suspension Height2 Inch Lowered
    Bushing ColorRed
    Progressive Rate SpringNo
    FinishPowder Coated
    Sold in QuantitySet