A few months back I ordered a computer from Nelson for my 2006 Tahoe 4x4.I installed it and everything was fine.I decided I wanted to change to 4.88 gears so I contacted Nelson and had another computer sent with the only change being the gears.I installed it today and followed all procedures with the relearns but now my transmission doesnt seem to be shifting right. I actually hit the rev limit before it shifted out of first gear at about 3/4 throttle.It seems to shift the same as the first tune in all other gears,could it be something I did wrong during the crank relearn? I will try to contact Nelson in the morning but I was just trying to get some opinions before I called them.