Transmission Gear Slipping problems of the 2013 Chevrolet Silverado

On acceleration from a stop, the rpm's race while shifting. Vehicle acts as if the transmission is slipping from 1-2. Early in the life of the vehicle I thought this was only something that happened the first time shifting after pulling out of the garage however, as the truck gets more miles on it, the problem happens more often and when taking off from stops when hot. Vehicle was brought to dealer to diagnose complaint and was told there was a bulletin to address this problem but since the tech couldn't verify it, they didn't do anything. Dealer said I have a good powertrain warranty so if something breaks later I should be covered. Not only is this unprofessional and poor customer service, they literally did nothing to attempt to diagnose or confirm the problem. There seems to be numerous complaints on this site related to rpm racing complaints.

Since I purchased this truck in June 2013, I've had several occasions where when the truck sits without being used for several days, when I back out of my driveway and put the transmission in drive, the transmissions slips. The truck won't move for a second, the engine rpm's race and then when the transmission catches, it will actually squeal the tires. Then at times it will continue to do this for the first several times I stop at a light or stop sign. This doesn't seem to happen once the truck has been driven for a distance, and it doesn't happen everytime the truck is used. I've talked to the service manager at the dealership and he says they've not had any issues with other trucks. I'm actually going to pick up the service manager and have him with me when I start my truck today after it has set for four days. I hope it does this with him in the vehicle so he can feel what's happening. I've been a loyal chevy owner for over 30 years but I'm really disappointed in this truck which costs $45,000.