I guess that could be the reason, however both make the same claims as you guys. I don't know I guess I'll just sell this one and try one of the others. http://killerbeeperformance.com/ talks a little bit about this issue maybe I need to call them. Maybe they could help.

Ok. Then what's the problem?? There seems to be other people with this problem but you guys never give a answer!! Like I said I tried a different tuner and didn't have a problem, so my question is could it have something to do with the tune?? It didn't do it with the ppe tuner or a edge tuner so it ...

Could it be that the shift points are not set right on the tune?? Because what it does is it jerks around and then it finally finds the gear and it's fine.

It's not Slippin it just seems like it can't find the right gear when you give it full throttle! I tried someone else's tuner of a different manufacture and it didn't have the shifting problem.

I have had the tune on for a month now and it still does the same thing! I really love this tuner, but I love my truck and don't want to mess up the transmission! Do you have any suggestions??

When I tune my 05 Duramax with the 80HP tune, I gain around 7 to 8 miles better to the gallon. I went from 18mpg to 25mpg and thats driving 70 to 75mph. If I drive at 65mph I have seen as much as 28mpg. I love this tuner

Mine is doing the same thing. It fells like it is slipping or something. I am running the 65hp tune should I try a different tune?? How long should it take for the tranny to as people say relearn?? Thank you any help