UMI Performance AB7450-1 Double Adjustable Coilover Lowering Kit with Viking Shocks

The UMI Performance AB7450-1 is a complete front and rear coilover lowering kit designed for street, strip, and corner-carving performance. Built around four Viking double adjustable shocks hand-assembled in Lakeville, Minnesota, this bolt-in kit requires no welding and no spring compressor for front installation. The hybrid front coilover spring system delivers a 0–3 inch front drop, while rear lowering springs offer your choice of a 1 or 2 inch rear drop to dial in the perfect stance and center of gravity.

Viking shocks feature 19 independent compression and 19 independent rebound settings, allowing you to switch from a comfortable street tune to an aggressive corner-carving or drag strip setup with a simple knob adjustment — no tools required. Baseline shock settings are provided as a starting reference: 6C/8R for all-around street, 10C/12R for corner carving, and 6C/2R front with 6C/6R rear for strip use.

Front Spring Rate Options:

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

Kit Contents:

• (2) Front double adjustable Viking coilover shocks
• (2) Front springs — choice of 250, 350, 450, or 550 lb/in spring rate
• (2) Rear double adjustable Viking shocks
• (2) Rear lowering springs — choice of 1-inch or 2-inch drop

Key Features:

• Bolt-in installation — no welding, no spring compressor required
• 0–3 inch front drop with easy height adjustment
• 1 or 2 inch rear drop selection
• 19 compression and 19 rebound settings per shock — independently adjustable
• Lower center of gravity improves handling and places the upper A-arm in a more favorable geometry
• Viking premium USA-made springs — shot peened and coated for long-term durability
• Shocks hand built in Lakeville, Minnesota

Optional Spanner Wrench & Thrust Bearing Kit: A spanner wrench allows front ride height adjustment while the shock remains mounted. The thrust bearing kit installs between the spring and spring seat to reduce friction and make height adjustments smoother and easier. This accessory is optional but strongly recommended — UMI does not advise making height adjustments without the thrust bearing kit installed.

UMI Performance's AB7450-1 coilover kit gives you the flexibility to run a comfortable daily driver, a weekend autocross setup, or a dedicated drag race configuration — all with the same four shocks and a turn of the adjustment knob.