hi my names marlene i have a 2002 ford gt mustang 4.6 i recently bought a used transmission for my car cause my old transmission **** up, now that my step dad put in the new used transmission my car is still doing the same thing it would do before, gears would slip, it would also jump gears, lock up on its own and ect. ect. i dont know what it can be now ?? sorry im new to this so idk how this stuff works :/