I have an '09 Silverado with the 4 Speed. It has less than 6,000 miles on it. When I backed out of my driveway on the start of a 300 mile trip and put it into drive, the rear end seemed to bind. I thought I had hit some mud and the G80 had kicked in. 300 miles later, I backed out of a parking place, put it in drive and the same thing happened. The next time I put it in reverse, the rpm's hit 2,000+ and there was no movement. After a few more failed tries to get it into reverse, I called On Star and had it towed to a dealer. The fluid looks and smells ok and the level seems right, but there was black soot on my fingers after I touched it. How should I handle the dealer on this one? Should I insist on a new tranny? I'll probably get a remanufactured one. What if he says he want to rebuild it himself? I presume this is a major failure.... Thanks for ideas.