Anyone have an 09..

[HUMMERICH23]

Yeah my transmission does the same too. It gets kind of annoying when you have to push the accelerator down pretty hard to get over a hill. However my tune helped out tremendously and have all the power i need to blast over a steep incline. I do know there are more recent TCM programmings that update shift points and make the 6 speed sooo much better. I am a frequent over at the denalitrucks.com board and they pretty much have the same 6-speed and issues and there was a service bulletin that updated the programming in the TCM and users have raved about how much better the 6-speed acts. I have not brought this up to the dealer yet because with my tune it hasn?t been such an issue but i think all you have to do is mention sluggish acceleration and delayed downshifting or holding the passing gear and not shifting in the overdrive gear.