So everything decided to craps at once but here's what I need help with. My rear diff. started to sling grease out the pinion seal. So when I started taking it apart, I removed the drive shaft and noticed the pinion moved around a lot as if the nut came loose. Problem is, the nut wasn't loose and none of the bearings look to be bad. I haven't got it completely clean up but know there aren't any broken parts in the case. I have not done much differential work and not sure how it could loosen up. Any ideas would be appreciated.