I have a 2001 GMC Sierra 1500 extended cab Z71 (4x4). I lost my transmission on Monday, Feb. 21, 2005. My truck only has 45K miles, so I know how pissed off you are. I went to the dealership where I purshased it, and because my warranty was expired, it was going to cost me $3000.00 to replace the transmission. I told them to wait on doing anything until I called them back. After searching the internet, I have discovered that it is a GM problem. We are not alone. This seems to be a faulty product by GM. I called the GMC customer service and informed them of the problem, and the fact that there were more customers compnaining about the same problem. After being on hold for 5 minutes, a rep came back on line and informed me that she would call the dealership and have put a new transmission in my truck for free. Moral of the story, "Squeaky wheel gets the grease." Call them and complain. (866) 932-4368