I just returnd from a 4,000 mile trip and had no issues. Now all of a sudden, when I start it in the morning and put it into reverse I have no power. It seems like as I back up, the emergency brake is on for about fifty feet. Then it is alright. I have noticed that it is not starting as well either. Not getting any kind of smoke. I have also noticed that even if I let it run for awhile and then try to back up it does the same thing. Even before I put it in gear I can only reach about 1,000 RPM even with the throtle all the way to the floor. It seems it has to be moving for about 50 feet to clear out. Of course we cannot get it to do it at the shop. The only difference is my driveway has an incline and the shop does not. We have noticed that the trans fluid is very dirty but was changed just 4,500 miles ago. It is a 2000 F-250 Super Cab 7.3 diesel. Injectors were bench tested and ok and had the o-rings replaced. No one seems to have an idea what is going on. To me it is like something has ahold of the crank or trany and will not let it spin till the truck has moved the 50 feet or so. I am wondering if anyone has any ideas. I am thinking my trans is the isue.