I am trying to rebuild my differential. The problem is the pinion gear. I removed the internal assembly from the diff. Now, I need to remove the pinion gear from the case. removed the front seal, oil sling, then how to remove the bearing without an SST? I thought once the internals are removed, I can just hit the pinion gear from outside, and the whole thing would come loose inside.. But, no matter how hard I hit it, it wont budge.. the pinion gear is making a grining noise as I turn.. this was the reason for the rebuild attempt.. thanks for any help..