I am gonna put a 454 or 502 in my 90 k5 and I am wondering whether I should go with the TH400 or the 4L80E. I heard the 4L80E was just as strong as the TH400 but it has overdrive. I do drive my truck daily and still plan on doing so. I also take it about 2 1/2 hours away quite often to go wheelin. Overdrive would be nice but my main focus is strength. What experiences do you guys have with either one of these transmissions?? I run 38's with dana 60 front and 14 bolt rear both are locked up. So any opinions would be helpful thanks.