Will a t5 from 1987 mustang fit a t5 in 1998 mustang?

Answer 1

Generally yes but but two very important points.

First, the T5 will only fit a 1998 3.8L v6 Mustang, not the v8 model which uses a T45.

Second, the input shaft and input shaft bearing retainer from the 1987 mustang need to be changed over to parts from a 1994-2004 t-5 transmission. Also, in 1987 the T5 was used in the 4cyl and 5.0 models. I would suggest using one from a 5.0 model because it is built to handle more torque. The 4cyl T5 risks being too weak.