The 1988 GMC Sierra was very much similar to previous generation Chevrolet C/Ks and slightly redesigned for 1988. It was offered in 3 series as 3500 (1-ton), 1500 (1/2 ton), and 2500 (3/4 ton).
1988 GMC Sierra Sportside and Wideside
1988 GMC Sierra came in either two-wheel drive or a standard Insta-Trac four-wheel drive. Models with back fenders were labeled as Sportside, while those without back fenders were labeled as Wideside.
1988 GMC Sierra
Variations in Bed Size
The shortbed models were designed with a 6.5-feet bed and wheelbase of 117.5 inches, while the long bed had 8-feet bed and wheelbase of 131.5 inches. The extended-cab version came as both 8-feet bed and wheelbase with 5 inches, or 6.5-feet bed and wheelbase with 141.5 inches.
Six passengers were able to sit comfortably in 1988 GMC Sierra extended-cab versions and had additional standard bucket or bench seats. Extended-cabs had also a folding bench, while other cabs obtained a two buckets or a bench seat.
1988 GMC Sierra Performance
A standard base engine of 4.3-liter V6 was used on the1988 GMC Sierra, which evolved decent power level of 160hp. Optional engines deployed in the 1998 Sierra were 5.7- and 5.0- liter gasoline V8s and the 6.2 liters diesel engine. Every model had the choice of manual or automatic shift transmission, with antilock rear-brakes.
