Gently used T5 transmission from a 1987 5.0 Mustang , would be a great upgrade to your automatic trans for your Hot Rod , Mustang or classic car restoration or muscle car. ( Without shifter ) ( with bell housing ) Not all Borg Warner/TREMEC T-5's are the same. The first T-5 five speeds were introduced to market in 1980, in all things, an AMC Spirit/Concord. In 1983, T-5's were introduced to Fox body Mustangs and continued to be used in V-6 Mustangs until 2010. The T-5 is the longest running five speed overdrive, standard shift transmission spanning more than 30 years of production. While there are numerous configurations of the T-5, because of the large quantities of T-5's produced, many parts are interchangeable. There are now over 200 different T-5 transmission assembly part numbers and almost as many ways to customize them to fit just about anything whether passenger car or light duty truck. World Class & Non-World Class There are two basic kinds of T-5's, Non-World Class (NWC) and World Class (WC). Many of the first NWC T-5's were used in AMC, Jeeps, and even the 280X . Contrary to popular belief, WC has nothing to do with strength. Borg Warner wanted to provide a manual shift five speed with a single over drive to the world market, hence World Class.