Alright I'm new to posting threads, so bare with me. OK to start off I have a '96 F250 Powerstroke. I blew the engine in it so i took the engine out of my dads wrecked '92 F250 7.3L IDI and placed it in the '96. The trans from the '96 is still in the truck and is hooked up to the 7.3 IDI. Also before I leave this out the IDI has sat for over 3 and a half years till now. It runs with minor problems. but the only major problem is that the truck wont get over 45 mph, even when throttle is to the floor. its not giving full rev throu the gears either it only gets full rev when in Park or Neutral. What could the problem be? the Transmission or the Engine.