UMI Performance A224-450T Front Coilover Adjustable Spring Lowering Kit 450lb Rate

The UMI Performance A224-450T is a complete front coilover kit designed for serious performance applications. This kit pairs a high-quality hybrid coil spring (Made in USA) with a Viking double-adjustable shock absorber, offering a versatile suspension solution for street cruising, drag racing, auto-cross, and road racing — all in one package.

At the heart of this kit is a 19-way independent compression and rebound adjustable shock, providing 361 possible damping combinations to dial in the perfect ride for any driving scenario. Every shock is individually built, dyno tested, and serialized at Viking's facility in Lakeville, Minnesota. Shocks can be rebuilt at Viking or an authorized Viking rebuild center.

Key Features:

• Includes (2) front coilover shocks — double adjustable compression and rebound (19 positions each)
• Includes (2) front hybrid coil springs — 450 lb/in spring rate (ideal for small block cruise or big block drag race)
• Bearing-mounted lower shock attachment for increased reliability and performance
• Brilliant protective finish for long-lasting corrosion resistance
• Coil spring compressor not required — the height adjuster acts as the compressor
• Optional thrust bearing and spanner wrench allow easy ride height adjustment (factory height to 3" lowering)
• Compatible with UMI lower a-arms or factory lower a-arms
• Hybrid coil spring manufactured in the USA

Front Spring Rate Guide:

• 250 lb/in — 11" tall springs for drag race only; serious weight reduction required
• 350 lb/in — Small block cruise or drag race with weight reduction required
• 450 lb/in — Small block cruise or big block drag race (this kit)
• 550 lb/in — Small block handling or all big block applications except drag

Mounting Options:

• Polyurethane — Suited for mild street applications; provides ride comfort and reduced harshness
• Bearing Mount (included) — Recommended for corner carving, drag racing, auto-x, and road racing; delivers increased reliability and precision

Optional Accessories (sold separately):

• Spanner Wrench — Allows ride height adjustment while the shock remains mounted
• Thrust Bearing Kit — Placed between the spring and spring seat for smoother, easier height adjustments; highly recommended but not required for installation

Pairs perfectly with UMI's geometry-corrected upper a-arm loaded with a tall ball joint. Whether you're headed to the drag strip, an auto-x course, or a weekend cruise, the UMI Performance A224-450T delivers the adjustability and durability to handle it all.