Very well may be the waveplate. Make sure the fluid is within the acceptable range first to rule out that simple problem.cna91 said:Any one have any idea of the symptoms I listed above? Thanks.
Search over on the Acadia forum...there is recent posts about corrosion in some connector that causes problems.
When my waveplate went, there was a slip, then rough shifting all the time, then grinding (especially bad in reverse) rather quickly.
Do you have any of the 5 year/100K powertrain warranty left?