UMI Performance A227-550T Front Coilover Adjustable Spring Lowering Kit 550lb

The UMI Performance A227-550T is a front coilover kit pairing a high-quality hybrid coil spring with a Viking 19-position double adjustable shock absorber. Designed for GM A-body and F-body platforms, this kit delivers a versatile, tunable suspension solution suitable for street driving, drag racing, auto-cross, and road racing — all in a single shock setup. Every Viking shock is individually built, dyno tested, and serialized at their facility in Lakeville, Minnesota.

Key Features:

• Includes (2) front double-adjustable Viking coilover shocks
• Includes (2) front hybrid coil springs — 550lb spring rate (recommended for big block vehicles)
• 19-way independent compression and rebound damping adjustment — 361 possible tuning combinations
• Adjustable ride height from factory height to 3" of lowering
• No coil spring compressor required — the adjuster acts as the compressor
• Hybrid spring design with brilliant protective finish for long-term durability
• Made in the USA
• Compatible with UMI's geometry-corrected upper a-arm or factory lower a-arm
• Shocks are rebuildable at Viking or an authorized Viking rebuild center

Spring Rate Options:

• 450lb — Recommended for small block vehicles
• 550lb (this kit) — Recommended for big block vehicles

Optional Accessories (sold separately):

• Spanner Wrench & Thrust Bearing Kit: The spanner wrench allows ride height adjustment while the shock remains mounted. The thrust bearing kit sits between the spring and spring seat, allowing the spring seat to rotate on a bearing for significantly easier height adjustments. UMI strongly recommends using the thrust bearing kit when making ride height changes.
• Bearing Mount Options: Choose polyurethane lower mounts for mild street use and ride comfort, or bearing end mounts for corner carving, drag racing, auto-x, and road race applications requiring maximum reliability and performance. Note: Performance mounting options, whether poly or bearing, may feel and sound different than OEM rubber-mounted components by design.

Pair this coilover kit with UMI's geometry-corrected upper a-arm loaded with a tall ball joint for the ultimate suspension upgrade — whether you're heading to a road course, the quarter-mile, or the weekend cruise.