UMI Performance AB8450-1 Double Adjustable Coilover Lowering Kit with Viking Shocks

The UMI Performance AB8450-1 is a complete double adjustable coilover lowering kit designed to deliver a tunable, performance-oriented suspension setup. Built around four Viking double adjustable shocks hand-assembled in Lakeville, Minnesota, this hybrid system gives you full control over ride height, compression, and rebound — all without specialized tools or welding.

The front coilover system provides a 0–3" lowering range, while the rear offers a choice of 1" or 2" drop via UMI's lowering springs. Lowering the ride height reduces the center of gravity and places the upper A-arm in a more favorable geometry angle, improving both handling and appearance.

Front Spring Rate Options:

• 250 lb/in — 11" tall springs; drag race only, serious weight reduction required
• 350 lb/in — Small block cruise or drag race with lightening required
• 450 lb/in — Small block street/cruise or big block drag race
• 550 lb/in — Small block performance handling; all big block applications except drag race

What's Included:

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

Viking Double Adjustable Shocks:

• 19 independent compression settings and 19 independent rebound settings
• Tune from street to strip to corner carving with a simple knob turn — no tools required
• Premium USA-made springs, shot-peened and coated for long-term durability

Baseline Shock Settings (Reference):

• 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: An optional spanner wrench allows front ride height adjustment while the shock remains mounted. The optional thrust bearing kit, placed between the spring and spring seat, reduces friction for smoother height adjustments. While not required to complete installation, UMI strongly recommends using the thrust bearing kit when making height adjustments.

This is a true bolt-in installation — no welding and no spring compressor required on the front. Whether you're building a street cruiser, a drag car, or a Pro-Tour corner carver, the AB8450-1 delivers the adjustability and quality to dial in your exact setup.