I need a little help here. My truck came with the th400 and a 350. The PO put in a 454 and for some odd reason a 350 trans with 6 or 9 inch tailshaft (haven't actually measured) Since the 350 is slipping like crazy I have decided to rebuild a 400 to put back in and that is where the problems start. The 350 has a slip yoke and I am told the 400 for a Crewcab 2wd has a bolt on yoke. Also that they would use a different u-joint. How can I determine what size u-joint is needed? I belive it would be the 1310 but am not sure. I also need a way to determine if the yoke on the drive shaft would have to be replaced, or the shaft lengthened/shortened. Since this is the 2 piece shaft I am hoping at most I would have to have work done to the small section that actually mates to the tranny. I think that most likely the PO used a conversion u-joint to go from the 350 to the 400 sized yoke on the shaft. Also I am missing the switch on the gas pedal for the 400 kickdown and apparently the wiring harness for it as well but I don't really know what to look for. All I can tell is there is no plug dangling next to the pedal that would obviously be for the switch. i haven't had a chance to crawl under the truck to try and find the harness from underneath. So any of you crewcab owners or anyone for that matter able to help me out with what I should be looking for as to the driveshaft yoke size, intermediate shaft length with 2wd 400, and what the harness looks like in the truck. Thanks in advance!