GMC is an American automobile brand and a subsidiary of General Motors (GM) organized as the General Motors Truck Company (GMTC) to sell General Motors Company (GMC) trucks; Rapid and Reliance, in 1911 with a range of 9 trucks from 1/2 to 6 tons capacity.
Rapid Motor Vehicle Company (Rapid) started as Grabowsky Motor Vehicle Company in 1900 and changed its name to Rapid in 1902. GM acquired a controlling interest of Rapid in 1908 and the remaining parts in 1909. Reliance Motor Company (Reliance) was started in 1902 and GM bought a controlling interest of the company in 1908.
GMC were producing both electric and gasoline trucks and the full line were badged as GMC by 1912 and all truck production was moved to Pontiac, Michigan. A new line of trucks designed by GMCT was introduced in 1914. Electric truck production ended in 1916.
Trucks and busses started to roll of a new 1.25 million square feet assembly plant in 1928. Buick, Pontiac and Northway (a GM subsidiary) engines were used for the vehicles. GMC started production of its own engines in 1931. Chevrolet built cabs were used on GMC trucks from 1931. Eight different displacement inline 6-cylinder engines were designed and GMC built by 1933.
GM bought Winton Engine Company in 1930, a producer of diesel engines and formed Detroit Diesel Engine Division in 1937. GMC introduced 2 cycle 3-71 (3 cylinders - 71 cid per cylinder) and 4-71 diesel engines in 1939. 4-wheel drive with 2-speed transfer case introduced in 1957.
Many of the GMC vehicles are similar to Chevrolet's except for different front and rear facias.