the ford gt40 made in the sixties and was called the gt "40" because it was 40 inches tall and the gord gt was made from 2004-2006 and was a couple inches taller.
GT is Grand Touring SS is Super Sport GTO is Grand Turismo Omologato GTI is Grand Touring Iniezone GTA for Gran Turismo Alleggerita and GTV for Grand Turismo Veloce