I have a 2015 Silverado High Country with a 5.3. Truck has 49,000 miles. I have been experiencing what I believe to be some transmission issues. It commonly shifts very hard into drive and reverse from the parked position. There is also a strange humming noise when doing about 55. I have also noticed that the truck shifts very hard from 1 to 2 and I also notice some significant rpm jumps while driving at a steady speed. Lastly, it seems to hesitate when leaving a stopped position and accelerating. I did bring the vehicle in and was told everything checked out with the transmission. I did read there was some sort of recall a while back relating to the transmission fluid needing to be flushed and changed. We had similar issues with my wife's GMC Acadia and it ended up being a bad torque converter(although the issue hasn't been completely resolved).
I have also noticed while idling, the truck seems to have a pretty decent "shake".
I have also noticed while idling, the truck seems to have a pretty decent "shake".
