Well I bought the SCT programmer since that seems to be the one everyone is recommending, not the extreme. Has all the latest updates, my truck has all the latest flashes... loaded up performance tune and stock shift points... truck shifts like crap! Slams into gear, the 2-3 shift feels like a double hit. Read somewhere here there truck shifting bad until they loaded the race shift points...did that...no different. Read here somewhere they said let the tranny learn so I did that...took 4 days for the truck to reseamble normal shifting. Still dosen't feel right but I don't think the truck will come apart now. So now it's time to pull my 27' Fountain to put it in storage, load the tow tune and here we go again!!! Same horrible shifting. Hooked the boat up and now the truck really feels like it's going to come apart. It has been 3 days since i pulled the boat and its close to the normal shifting again but still not right. Needless to say I just loaded the stock tune back up but haven't drivin it yet.
Talked to SCT via email and they said "No, that is not normal but we are working on a new firmwire for the towing tune" but they have not answered my return requests for info on what the problem is.
Site rocks by the way, nice to find people that actually no something about these trucks.