At AutoBuyGuide.com, you can learn everything that you need to know about the vehicle of your choice with 1991 GMC R3500 specs. Visiting a car dealer is great for test drives, but 99% of car dealers won't be able to give you a detailed breakdown of the 1991 GMC R3500 specifications for the exterior, interior, and handling. Most car dealers won't be able to tell you the dimensions, cargo space measurements, vehicle weight, and some may not even be able to tell you the different 1991 GMC R3500 engine options! View specs and car data below, and learn everything you need to know before making a final decision on your next car.