Well this is rather annoying. Bought a 2016 Silverado with about 40,000 miles on it just a couple years ago. 84,000 miles on it now and just got a call from the dealer that the reason why it won't shift, revving, jumping and going into limp mode is because it needs a new transmission.
For only $7,500 I can get a new transmission with a 3yr, 100,000 mile warranty on it.