Hi all -- As always thanks in advance for the info! I have an 87 silverado k5, TBI 305, 700 Raptor, NP 208, Corp 10 bolt, no lift, 32" tires. I am consistently developing leaks around the pinion. I have replaced the outer pinion bearing and seal, and the seal again. It will fix itself for a few months and come back. There aren't any other leaks in the ole pumpkin. At one point, I had an outer bearing go bad ... lots of vibration which lead to the original leak. So I have a few questions. (1) How much do I tighten down the pinion nut? I've heard everything from counting threads before hand to as tight as you can get it with the air gun. Would this matter in the leak? (2) Would a plugged vent cause this problem to reoccur? the vent line looks to be in good shape, attached to the bottom of the bed ... but I haven't actually checked it for obstructions. how would I check that? (3) There doesn't appear to be a worn area on the yoke that would screw up the seal. Would replacing the yoke fix things? Where do I get one? $$? (4) Could that original vibration in the driveline from the yoke wobbling have screwed something up so bad that it's time for an overhaul? Timely responses are appreciated ... I have to road trip to NOLA friday afternoon and I'd like to not frag the rear end on the way due to lack of lube.