UMI Performance AB8350-1 Front & Rear Coilover Adjustable Spring Lowering Kit with Viking Double Adjustable Shocks

The UMI Performance AB8350-1 is a complete front and rear coilover lowering kit designed to dramatically improve ride height, handling, and overall performance. Built around Viking double adjustable shocks hand-assembled in Lakeville, Minnesota, this bolt-in kit requires no welding and no spring compressor, making installation straightforward for the serious enthusiast.

The hybrid front coilover system provides a 0–3" front drop range, while the rear accommodates either a 1" or 2" rear drop via included rear lowering springs. By lowering the center of gravity and placing the upper A-arm in a more favorable geometry, this kit delivers measurably improved handling characteristics on the street, strip, or autocross course.

What's Included:

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

Front Spring Rate Guide:

• 250 lb/in — 11" tall drag race spring; serious weight reduction required
• 350 lb/in — Small block cruise or drag race; some weight reduction recommended
• 450 lb/in — Small block street/cruise or big block drag race
• 550 lb/in — Small block handling and all big block applications except drag race

Viking Double Adjustable Shock Features:

• 19 independent compression settings and 19 independent rebound settings
• Tune from street to strip to corner carving — no tools required
• Premium USA-made springs, shot-peened and coated for long-term durability
• Baseline shock settings: Street: 6C / 8R all around | Corner Carving: 10C / 12R all around | Strip: 6C / 2R front, 6C / 6R rear

Optional Spanner Wrench & Thrust Bearing Kit: A spanner wrench is required to adjust vehicle ride height while the shock remains mounted. The optional thrust bearing kit installs between the spring and spring seat to reduce friction during height adjustments, allowing for smoother, easier tuning. While not required for installation, UMI strongly recommends using the thrust bearing kit whenever making height adjustments.

Viking springs are manufactured in the USA, shot-peened for fatigue resistance, and coated for corrosion protection. This kit delivers a true performance coilover experience in a bolt-in package — no fabrication required.