Royal Purple tranny fluid is known to help some. Just put the GM crap back in before warranty trans service.
Syncros may still break-in some.
May need another tranny.
None posted so far.
We do believe any unit will break with excess wheel-hop.
It is a waste for jrhaus76, but I am getting a lot out of this thread.
And quite frankly, if I owned one of the questionable range of cars, I probably wouldn't be so calm calm about it.
Maybe I would:
1. Let it go, and just see if it breaks someday - you know, maybe after the warranty is expired...
2. Beat the hell out of it, minus wheel-hop, and see if it breaks when I expect it to, rather than when I am pulling out in front of traffic with my kids in the backseat.
Sudden, total drivetrain failure, IS a safety hazard. I'd be suing the hell outta the NEW GM, if mine broke and caused an accident.
3. Spend the money to install an upgraded output shaft, available in the aftermarket soon. Might as well put in axles with cv joints that don't explode too.
$$$$
GM does listen to us. Sometimes they just wait for the mass media to pick up on our feelings before they respond, that's all.
Burying this issue in the "forbidden zone" seems to be extending the issue though.
I've never seen another car forum, that hides issues in a back-room, seldom visited area.