UMI Performance GBF250-1 Double Adjustable Coilover Lowering Kit with Viking Shocks

The UMI Performance GBF250-1 is a complete bolt-in coilover adjustable spring lowering kit designed to transform your vehicle's stance, handling, and on-track performance. This hybrid front coil-over system pairs four hand-built Viking double adjustable shocks with a choice of front spring rates and Hotchkis rear lowering springs — delivering tunable performance for street, strip, or corner carving without welding or a spring compressor.

What's Included:

• (2) Front coil-over shocks, double adjustable — hand built in Lakeville, Minnesota
• (2) Rear shocks, double adjustable — hand built in Lakeville, Minnesota
• (2) Front springs with choice of 250, 350, 450, or 550 lb spring rate
• (2) Rear Hotchkis springs with choice of 1" or 2" rear drop

Front Spring Rate Guide:

• 250 lb — 11" tall springs for drag race only; serious weight reduction required
• 350 lb — Small block cruise or drag race; some weight reduction required
• 450 lb — Small block cruise or big block drag race
• 550 lb — Small block handling or all big block applications except drag race

Key Features:

• 0–3" front lowering range; 1" or 2" rear drop options
• Viking double adjustable shocks with 19 compression and 19 rebound settings
• Tune from street to strip to corner carving at the turn of a knob — no tools required
• Lowered ride height places the upper A-arm in a more favorable angle for improved handling
• Premium USA-made Viking springs, shot-peened and coated for durability
• True bolt-in installation — no welding, no spring compressor required
• Easy front height adjustment compatible with optional Torrington thrust bearing kit and spanner wrench

Baseline Shock Settings (Reference):

• All-around street: 6C / 8R all corners
• All-around corner carving: 10C / 12R all corners
• Strip: 6C / 2R front, 6C / 6R rear

Optional Spanner Wrench & Thrust Bearing Kit: The spanner wrench allows front ride height adjustment while the shock remains mounted. The thrust bearing kit is placed between the spring and spring seat, reducing friction during height adjustments. While not required to complete installation, this accessory kit is strongly recommended for easier and more accurate adjustments.

UMI Performance's GBF250-1 lowering kit provides the flexibility to dial in your vehicle's altitude and attitude for maximum performance and an aggressive stance — all with a straightforward, tool-friendly installation process.