UMI Performance A204-250S Viking Front Coilover Kit Double Adjustable 250lb Spring Rate Poly

The UMI Performance A204-250S is a front Viking coilover kit engineered for GM A-Body applications, pairing a high-quality USA-made hybrid coil spring with a Viking 19-position double-adjustable shock absorber. Designed to handle everything from daily street driving to competitive drag racing, this kit delivers a wide range of tuning flexibility in a single bolt-in package.

At the heart of this system is the Viking double-adjustable shock, which features independent compression and rebound adjusters with 19 positions each, yielding 361 possible damping combinations. 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.

The hybrid coilover spring design is unique: the upper coil fits directly into the vehicle's factory upper spring perch, while the lower section interfaces with the coilover shock body. No spring compressor is required — the threaded adjuster collar serves as the compressor, and ride height is adjustable from stock to 3 inches of lowering.

Kit Contents:

• (2) Front double-adjustable Viking coilover shocks
• (2) Front hybrid coil springs — 250 lb/in spring rate, 11" tall, for drag race applications
• Polyurethane lower shock mount bushings

250 lb Spring Rate Application Note:

• 250 lb: 11" tall springs intended for drag race use only — serious front-end weight reduction required

Additional Spring Rate Options Available:

• 350 lb: Small block cruise or drag race with front lightening
• 450 lb: Small block cruise or big block drag race
• 550 lb: Small block handling, all big blocks except drag race

Polyurethane vs. Bearing Lower Mount: This kit includes polyurethane lower shock mounts, which are well-suited to mild street applications and prioritize ride comfort. For corner carving, drag racing, auto-x, or road racing, the bearing-mount version (A224 series) is recommended for increased reliability and performance. Note that performance bushings — poly or bearing — may feel and sound different compared to factory rubber-mounted components.

Optional Accessories (sold separately):

• Spanner Wrench: Required tool for adjusting ride height while the shock remains mounted to the vehicle
• Thrust Bearing Kit: Installs between the spring and spring seat to allow the seat to rotate on a bearing, making height adjustments significantly easier. Strongly recommended — height adjustments without the thrust bearing kit are not advised.

This coilover kit is compatible with both UMI's performance lower a-arm and the factory lower a-arm. For maximum handling performance, pair with UMI's geometry-corrected upper a-arm loaded with a tall ball joint. The A204-250S is 100% designed and manufactured in the USA.