increased slightly over the years. The exception was early model tandems, which shared their separate wheelbases. All models were available as semi-tractors, gasoline models had a Gross Combination Weight Rating (the loaded weight of the truck and any trailers) of and diesel models had a rating. 1972-1974 Models Powertrain The Fleetstar series offered a wide range of engines. Most models offered several gasoline engines and a mid-range diesel. 2000 and 2070 models had heavy duty diesels. Most Fleetstars had five speed transmissions, often with a two speed rear axle, but a six speed automatic was sometimes an option. Heavy duty diesels had vendor transmissions with up to 13 speeds. Engines (Highest rated in different truck models.) Notes References Further reading External links International Harvester Fleetstar (Internet Movie Cars Database) International Harvester vehicles