I have a 93' 3500 dually with a 454 and 4l8oe transmission. I lost all forward gears at one time. I have a 94 1 ton with a 5.7 vortec with a 4l80e and would like to swapp the transmission . The wiring looks to be slightly differnt not sure if i should/can make the swapp. If so what do i need...