GM produced the fourth generation of the Chevy/GMC C/K Truck (known within GM as the GMT400) from model years 1988-1999. In 1990, Chevrolet introduced a high-performance variant of the GMT400 called the 454SS. It was available only as a 2WD half-ton regular cab short box in Onyx Black only with a garnet red interior. Powering the 454SS was a 454 cu in (7.4 L) V8 that produced 230 hp and 385 lb⋅ft of torque. A 3-speed Turbo Hydra-Matic 400 and 3.73 rear axle ratio put all that power to the ground. The axle itself is unique, being a 14-bolt semi-floating unit which uses standard Chevrolet 5 on 5-inch wheels—the only factory-produced 14-bolt axle with such a wheel bolt pattern. The suspension was also upgraded with 32 mm (1.3 in) Bilstein gas-filled shock absorbers, a 32 mm (1.3 in) front stabilizer bar, and 12.7:1 fast-ratio steering gear assembly.
Unique exterior features included a front air dam with fog lights, special rims, decals displaying “454SS” on the bed sides, red trim emblems, and black painted grille, bumpers, and mirrors. The interior was also unique with a special plush Garnet Red cloth with black trim, high-back reclining sport bucket seats, and center console.
The Onyz black repaint appears to be perfect and the original bright red interior presents very well. The only modification made to the truck appear to be an upgraded sound system.