UMI Performance AB8250-1 Double Adjustable Coilover Lowering Kit with Viking Shocks

The UMI Performance AB8250-1 is a complete bolt-in coilover and lowering kit featuring four Viking double adjustable shocks, a hybrid front coilover spring system, and rear lowering springs. Designed for maximum versatility, this kit lets you dial in your car's ride height and handling character for the street, strip, or track — no welding and no spring compressor required.

What's Included:

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

Front Spring Rate Guide:

• 250 lb/in — 11" tall springs for drag race only; serious vehicle lightening required
• 350 lb/in — Small block cruise or drag race with lightening required
• 450 lb/in — Small block cruise, big block drag race
• 550 lb/in — Small block handling, all big blocks except drag

Key Features:

• 0–3" front lowering range via the hybrid coilover spring system
• 1" or 2" rear drop selection via choice of rear springs
• Viking double adjustable shocks with 19 independent compression and 19 independent rebound settings — tune from street to strip to corner carving by turning the knobs, no tools required
• Premium USA-made Viking springs, shot peened and coated for long-term durability
• Lowered ride height reduces center of gravity and places the upper A-arm in a more favorable geometry angle for improved handling
• Easy front height adjustment; optional Torrington thrust bearing kit and spanner wrench available for even easier on-car adjustments
• Bolt-in installation — no welding, no spring compressor needed

Baseline Shock Settings (Starting Points):

• All-around street: 6C / 8R
• All-around corner carving: 10C / 12R
• Strip (front / rear): 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 seats between the spring and spring seat on the shock, reducing friction during adjustment. Both accessories are strongly recommended for ease of use, though neither is required to complete the base installation.

UMI Performance's AB8250-1 coilover kit delivers a balanced combination of adjustability, American craftsmanship, and proven Viking shock technology — whether you're building a Pro-Tour cruiser, a weekend autocrosser, or a dedicated drag car.