I've been plowing for 10 years with a ratty K5 6.2 Blazer, and a few days ago the rear differential all of a sudden made some death noises. So I jacked it up and pulled the driveshaft. I've got about 75 degrees of rotation-play in the pinion yoke. So I left the drive shaft off and plowed my yard, a couple of times it felt like the rear differential was binding up, even though there was no driveshaft, I was driving it in front wheel drive. I haven't pulled the cover, but what what can I expect to find inside?