I believe all of the late model Broncos used 4 but if you want to make sure, you can remove the dust protection plate from the front bottom of the trans, then hand crank the motor (clockwise) until you see one of the nuts. Color it with a grease pen or something. Then, hand crank til you see another and count it. Continue til you get back to the one with the mark on it...how do i know which one i got? without removing it and physically checking.