Pulled the rear third member on the BJ73 to address what I thought was a worn out pinion bearing and bad seal. Pinion nut was loose. I'm guessing previous owner hit a rock or something and crushed the crushwasher a bit, but then there was slack. I Snugged it down to a better preload, reset backlash from .015 to .007 and installed a new pinion seal. I had some slack in the driveline and a little vibration at highway speed from the pinion wobble. Hopefully she'll be tight and smooth now.............Spartan locker goes in on reassembly tomorrow.