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All models were provided with either a standard manual or an automatic transmission and antilock rear brakes during early generation of GMC Sierra trucks.

1990 GMC Sierra Trucks

The 1990 GMC Sierra was designed in short-bed, long-bed, and extended-cab models. A 117.5-inch wheelbase along with 6.5-feet bed was deployed in short-bed, while 131.5-inch wheelbase along with 8-feet bed, and either a 155.5-inch wheelbase.

8-feet bed with a 141.5-inch wheelbase as well as 6.5-feet bed was deployed in extended-cab models.