My neighbor up at my cabin and I both have the new '11 Big Boss. Neither of us have had the broken bolt yet that many others have had, but we both carry spares now. Well he came to me a week ago and asked me if I ever had any problems going down steep hills. His machine would pop out of gear slightly and make a horible grinding sound. When he would stop it would pop back in on its own and everything would be fine until he went down another steep hill with a little weight in the bed.
He took it in to HP and they tore it down and didnt find anything. He also talked to a mechanic at Marita and said that they have that problem in the Rangers mostly, but they have the same tranny. They are telling him that the front side of the gears and the backside of the gears are slightly different. While you are on the gas the gears are meshing fine, but when coasting the spring that holds the gear in place is too week to hold it in place allowing the gear to pop out slightly due to the shape of that gear face.
By the sounds of it there is really not much that can be done. They put a slightly stiffer spring in his but it is still doing it. He said that if you put too stiff a spring in there you would not be able to shift it and would have other problems.
After he told me about it I have had it happen to me now. Is anyone else having this problem?