I purchased this BX nearly 20 years ago, it has over 1100 hours on it. At the end of last season, I broke the left side of the rear diff, and bent the left axle. Don't ask me how, I will just say it was not the fault of the tractor Over the winter I obtained a nice used diff case and axle. I took everything apart and switched it all over. It now seems to work well except going up a steep hill forward in low gear, especially mowing, it bogs to the point of dying if I don't ease off of it. It goes up the side of a cliff in reverse. So I am mowing my steep dam bank by backing up. I now I have missed something, but as of yet I have not found it. If anyone has any ideas that I might ty, I would appreciate it!