Now I know why the dealer was set on keeping my rig. My '05 3500 CTD 4x SRW less than 15k miles automatic began mis-shifting at freeway speeds, from third to forth, back to third and forth, for no reason at 4500-5000 RPM. Took it in and was told a sensor needs to be repalced. The replaced sensor didn't do any good, according the the transmission guy at the dealer. They've given me a loaner car and told me they are going to tear the transmission appart to determine where the problem is. Aside from this, I have noticed an issue with Park and Reverse, though I always set my parking break. I'll let you know how it goes.