tranny not shifting right

[denial]

has anyone else had any problems with their transmissions not shifting correctly, mine revs higher before going into 3rd or really just takes a second to shift and shifts hard, I took the programmer off and it still does it. sorry the explanation is that good

[SuperchargedSS]

something doesn't sound right? 4L60?

[Zed 71]

08 Denali has the six speed, which has the awkward shifts. Has the shift points/conditions changed since you bought it? Did the Hypertech even modify the transmission settings? In any case, just make sure the Hypertech reverts to the stock program and bring it in to the dealer.

[JennaBear]

Try taking your throttle body spacer off and setting the PCM back to stock.