Not All T-5's are Created Equal
Not all Borg Warner/Tremec T-5's are the same. The first T-5 five speeds were introduced to market in 1981, in all things, a AMC Spirit/Concord. In 1983, T-5's were introduced to Fox body Mustangs and are still used in the 3.8L V-6 Mustangs. The T-5 is the only American made standard transmission to span more than 20 years of production. 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 still counting.