UMI Performance 78-88 GM G-Body Spring/Shock Lowering Kit 1in Rear 250lb - GBF250-1

UMI’s lowering package features four Viking double adjustable shocks, a hybrid front coil-over spring system with 250 lb front springs, and your choice of 1 or 2-inch UMI rear lowering springs. The 250 lb springs are 11" tall and intended exclusively for drag racing applications with significant vehicle weight reduction, providing excellent front-end lift and weight transfer for improved traction. The hybrid front coil-over system allows a 0–3" adjustable drop, while the rear springs offer 1" or 2" lowering options to fine-tune stance. Viking’s shocks provide 19 compression and 19 rebound settings, letting you dial in suspension performance for street, strip, or cornering with simple knob adjustments—no tools required. The bolt-in design eliminates the need for welding or a spring compressor for the front, and optional Spanner Wrench and Thrust Bearing Kits make height adjustments smoother. This setup is purpose-built for drag racing performance and is not recommended for street handling applications.

Features

• 0-3" lowering range up front, 1 or 2 inch choice for the rear
• Lower ride height improves handling by lowering center of gravity
• Lower ride height improves handling by placing the upper a-arm in a more favorable angle
• Viking features Premium quality Made In USA springs, shot peened and coated for durability
• Easy front height adjustment with optional Torrington bearings and wrench
• Shocks hand built in Lakeville, Minnesota
• Double adjustable features 19 independent compression and rebound settings (for a total of 361 possible combinations)
• Tune for street, strip or corner carving at the turn of a knob
• no tools required
• Baseline shock settings
• 6C,8R all around street, 10C,12R all around corner carving, 6C,2R front and 6C,6R rear strip
• Bolt in kit, no welding required. And best of all, no spring compressor required up front
• Front coil over shocks, double adjustable
• Rear shocks, double adjustable
• Spanner wrench tool is used to adjust vehicle height while shock stays mounted
• Thrust bearing kit designed for easier adjustments but not needed for installation

Application

• UMI designed GBF250 to fit 1978-1988 GM G-Body