Downshift problem 2011 GMC Acadia

[levittownnick]

I have a 2011 GMC Acadia Denali that I purchased new and have regretted it ever since because of the stupid way it down-shifts. (Other than for the down-shifting I am reasonably, but notcompletely satisfied with the vehicle.) From a stop or low speed the acceleration is as good as I need or care to have, but above about 40 mph the down-shifting gets stupid. I can't figure out if it is going to shift just 1 gear down or go down so low that the engine revs over 6K and the truck goes no where. Sometimes it feels like it just shifts into Neutral.

I did speak to the service advisor about this and he acknowledged that since they changed the design a year or so previously that this happens and there is not anything he can do about it. I realise that I'm a jerk for not doing something while the truck was new because I am concerned about voiding the warantee.

The question is: Is there an after-market software fix for this condition?

Thanks,
Nick

 

[Scott Danforth]

hundreds of hits on this found with a simple google search https://www.google.com/search?q=2011+acadia+downshift&ie=utf-8&oe=utf-8

have you had your transmission reflashed (was a TSB on that back in 2011)
have you had your 3-5-R wave plate replaced (common acadia trans failure item)

 

[MTboatguy]

Get a hold of a good transmission shop, the GM vehicles from the last few years, really benefit from a good quality shift kit.