The pains of working out the kinks of a new design. Frustrating for sure. I haven't broke anything "yet" but I have all sorts of clunking sounds when the tranny hunts between 2nd and 1st (rolling to a stop or under 15mph slowing and then accelerating).
The most recent issue is a harmonic ringing sound coming from the drivetrain between 30-40mph. It almost sounds like a subtle but annoying whine (like you have super swampers on it). I am just waiting for it to blow.
GM has some work to do on the transmissions and full-time all wheel drive.
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