Mustang transmission griding, or not going in to gear anymore? Latemodel Restoration Supply offers Mustang transmission rebuild kits, T-5 rebuild kit, Mustang input shaft seal, Mustang shift fork and don't forget your Royal Purple transmission fluid. We also have Mustang transmission tail shaft seal and Mustang tail shaft seals. This is one of those parts that you just happen to walk out one day and see a puddle of oil under your Mustang. Years 1983,1984,1985,1986,1987,1988,1989,1990,1991,1992,1993, and 1994,1995,1996,1997,1998,1999,2000,2001,2002,2003,2004.