I have a 8870 that you can be driving along with no problems and all the sudden it acts like you have put it in neutral, but it still says that it is in gear. You can try to shift forward and reverse and the display will tell that it is going into gear both ways, but it will not do anything. It will not change gears as far as upshift or downshift though either. I have the fault codes from the display on the dash and they are codes p350 thru p364 and also code p450. Does anybody know what these fault codes mean? This is really starting to be a irritating situation with this tractor. It has 5800 hours on it. We leave it alone after looking all over on it, walk away and come back and it will usually work the next day until it does it again. It did it to me tonight while i was in reverse trying to stack bales. It also did it yesterday while driving down the road in 16th gear, and then just like you put it in neutral, and we ended up pulling it home to get it off of the road. Anybody have any ideas?