GM Hydromatic 4L80 transmission, 4X4, in good working condition when removed from truck but priced as a core due to sitting for some time, 1991 model, Chevrolet bolt pattern. Truck had been parked for several years. Truck was a plow truck with 133K, however sticker on transmission indicates it has been replaced. Correct for 1991-1992, and may fit others, do your own research. $250