The GMC R2500 was a short-lived, three quarter-ton version of the 3rd Gen GMC C/K that was introduced for the 1987 model year. The R2500 was largely a renamed version of the 3rd Gen C2500 that was created while GMC transitioned from the C/K to the new GMC Sierra. The R2500 was a rear wheel drive pickup that was offered in long or short bed lengths, with a choice between the fendered Fenderside or sleek Wideside truck beds. Engines available ranged from a 250ci inline six to a 454ci V8, with the most common engines being the 305ci or 350ci V8s. In addition to gasoline engines, a diesel V8 option was offered most years. Both manual and automatic transmissions were available, regardless of the engine. Production of the 3rd Gen GMC R2500 ended in 1989 when it was replaced by the new GMC Sierra.