Showed my wiring guy this... 4L60E to 4L80E Wiring Swap - PerformanceTrucks.net Forums and he says he put pin T in location U instead of S into location U. Should explain the problem. We are going to fix it friday night.
I drove it around town a bit tonight and it gave me 4th gear everytime no problem.
Still unsure about the 1-2 shift issue. Probably need the second vss plugged in. Any idea where I can get another vss plug and pigtail?
P.S. - I've emailed Allen @ Nelson Performance THREE times about a possible tune issue and cant get a response. Any idea? Dont like being ignored.