Ok guys I have a 2008 GMC Sierra 1500 NFL edition truck that I bought in MAR. It currently has 2200 miles on it. About 4 days after purchase I noticed while driving in my neighborhood that when shifting from 2nd-3rd there was a weird zipping noise and feels like a toy zip car under your feet when it shifts. This is only noticed from the drivers side, you can not hear it or feel it from the passenger side, also it is only noticed at slower speeds. I took it back to the dealer and they said it was normal. Does anyone else with an 07-08 have this same problem? I also noticed that if I am slowing down to stop but then re-accelerate it feels like the tranny slips, it feels like the rpms go up then the tranny catches up and causes a slight jerk, this only happens on occasion. Any input would be great. Thanks

 

My buddys 07 tahoe had 25,000 miles on it when it got new tranny, and now it almost has 50,000 on it and the fluid is burnt smelling and black.......

 

Im starting to think this is a common thing with GM tranny's! Then when you take it to the dealer they look at you like you are crazy for even bringing it in.