I know somebody asked a simaliar question early but nobody responded so I'm going to give a shot. Um I have a 5 speed off a 88 mustang lx that had a 2.3L and I was wondering if I could swap the 5 speed with the 4 speed becaue the 4 speed is just killing me on gas because while driving on the highway it keeps the engine revived up so high because theres no overdrive at about 65 mph the rpm is 3000 thats insane. It should only be half that. Tell me what you think, thanks