A guy at work had the shifter pin break on his Duramax had to drive home 30 mph for 5 hours. He took it in to the shop and they said this is a common pro blem with the Duramax Allision combo. They said sometimes driving down the road it will happen and the truck will shift into reverse. Plow truck drivers have also had alot of problems with this. I'm going to be aware when I'm behind them now HAHAHA.