My father has a 2004 Chevy Silverado 2500 Duramax Diesel that hesitates when he shifts into reverse. I've been searching chat sites all evening and it looks like there might be some Allison transmisson experts here. He's talked to other owners and found that they have this problem. The dealers can't find anything and even after speaking to Allison he couldn't get any real information. His worry is that the transmission is going to breakdown in the middle of one of my parent's trips. Anyone experience this?