My 05 has the 1-2-1-2 or 2-3-2-3 shift problem like so many of you out there . I finally called the DC complaint line to register a complaint about the dealer and the factory guy, after 3 years I think I' ve been more than patient with them all. At the defence of my dealer I beleive they have done all that DC will let them do now I'm down to a bunch of dumb looks and "we will have to start all over" because of people changes at the dealership and at the factory tech positions.
My question is have you guys had failures or longevety problems with your trannys that act like this?
Mine really started acting up the other day and that prompted the call.
"I stands it and I stands it till I cant stands it no more"

 

sure its a 1-2, 3-2,... shifting. Mine goes from 4 at 30mph ,climb a slight grade and it downshifts to 3rd then 2nd and back to 3rd when I let off the throttle. At first I thought it was 2-3-2 shift but watching the shift monitor on my edge its not, at least not on my truck anyway.

 

There is a TSB out for this problem. Your dealer should know about it. My 2007 was doing the 1-2-1-2-1-2 thing under light throttle, but the dealer fixed it under warranty.