I have a 1993 K2500 6.5 Turbo Diesel. I lost reverse in my 4l80 and replaced it with a TH400. When I start the truck it runs for about 30-45 seconds and then dies. My 4wd fuse also blows the second I turn the key (not sure if they are related). In that few seconds it runs I have forward and reverse and can drive. Any ideas? I am not sure if there is something I should be doing with all the leftover wiring from the 4l80 that I am not using that could be causing this as well. My wife is about done with me messing with this truck, I may be living in it if I can't figure this out soon.