I was just double checking, and according to the book, you are going to have to at least take the right brake assembly off the transmission housing so you can slide the differential to the right enough to get the pinion out. The pinion shaft has to slide back a few inches before it comes out of the front bearing support. Watch the thrust bearings that go between the bull pinions and the differential, chances are they are shot. Last I knew, there was no replacement, but I have heard of people making brass thrust washers to takes their place.