This product is a vintage 3-speed manual transmission from GM, D 13 0 specifically for Chevrolet vehicles from the 50s and 60s. It features a cast iron housing and an external rod shift linkage type. The main case number is 3743368, and the tail # 374156 and cover # 3741357 it is an OEM manual transmission for Chevy, Corvette, and other GM vehicles. Made in the United States, this manual transmission is a rare find for those looking to restore or upgrade their classic vehicles with authentic GM parts. Personally removed from a 1961 corvette in 1980 and has been in my garage ever since, selling as is.