Ihave a 69 ford f-100 with a Ford 9 inch,installed a 302 with Aod tranny.It has like 3.93 gears .Even in overdrive doesnt doesnt cruise at very low rpm.My 69 mustang has a 9 inch with 2.76 gears .Was thinking of swapping the two.The truck is just a cruiser no hauling ,and would like to get the rpm down.What problems would I have with a swap? 75 mustang II