UMI Performance A227-450T Front Coilover Double Adjustable Lowering Kit Spring Rate - 450lb

The UMI Performance A227-450T is a front coilover kit engineered for GM A-Body, F-Body, and similar platforms, pairing a high-quality hybrid coil spring (450 lb/in rate) with a Viking double-adjustable shock absorber for a versatile, performance-tunable suspension package. Designed for street driving, drag racing, auto-cross, and road course use, this kit delivers factory-to-3-inch ride height adjustment without requiring a coil spring compressor.

Kit Contents:

• (2) Front double-adjustable Viking coilover shocks — built, dyno-tested, and serialized in Lakeville, Minnesota
• (2) Hybrid coil springs — 450 lb/in spring rate (for small block applications)
• Protective brilliant finish on springs for long-term durability

Key Features:

• 19-way independent compression and rebound damping adjustment — 361 total tuning combinations to dial in the perfect ride for any application
• Hybrid coil spring design — upper portion fits the factory upper spring perch; lower portion mates directly to the coilover shock body
• No spring compressor required — the height adjuster collar acts as the compressor for safe, straightforward installation
• Factory to 3 inches of ride height lowering — adjustable via spanner wrench with shock remaining mounted in the vehicle
• Rebuilable shocks — can be serviced at Viking or any authorized Viking rebuild center
• Made in the USA

Optional Spanner Wrench & Thrust Bearing Kit:

A spanner wrench is required to make ride height adjustments with the shock in place. The optional thrust bearing kit installs between the spring and the lower spring seat, allowing the seat to rotate on a bearing for significantly easier height changes. While not required for installation, UMI strongly recommends this kit for anyone planning regular ride height adjustments.

Lower Mount Options:

• Polyurethane bushing mount — recommended for mild street applications; provides improved ride comfort and reduced NVH compared to solid bearing mounts
• Bearing end mount — recommended for corner carving, drag racing, auto-cross, and road racing; offers maximum reliability and performance under aggressive driving conditions

Spring Rate Options:

• 450 lb/in (this kit, A227-450T) — optimized for small block engine applications
• 550 lb/in (A227-550T) — optimized for big block engine applications

Viking coilovers are fully compatible with UMI's geometry-corrected upper A-arms and lower A-arms, as well as factory lower control arms. Pairing this kit with UMI's tall ball joint upper A-arm maximizes suspension geometry correction for spirited street driving, autocross, or track use.