I have a 950 John Deere with a 75 loader and a 8A back hoe on it. The tractor started cracking rear wheels a couple years ago and now the transmission case broke in two. has anyone out there had this happen. If so how can I prevent this from happening again short of not mounting the back hoe on the tractor again. I have used the back hoe less that 200 hrs. For those of you that do not know the Deere back hoes have a sub frame that mounts on the loader bracket.