Sorry guys I am new to mustangs, Just bought this GT... Does it have a 4 speed Auto or just a 3 speed?, I do not see an overdrive..Is it a built in OD? The shifter only has 1,2,3 on it...Tranny is slipping bad when going into passing gear..Is there any common upgrads for this year model tranmission? The Motor is built decent and dyno's 285 RWHP so I need it to hold up to atleast that amout of power..Any help would be great ..Thanks