I hope you were not in the middle of no where when this happened.
First before you take off the nut mark it with a scribe so you can see where the not sets on the pinion shaft then count the number of turns it takes to remove the nut. When tightening the nut back, just realign the marks. Since the seal is still leaking it may have been damaged. Make sure to lube it before installation. I usually fill the area where the spring sets with grease.
Watch this video
https://www.youtube.com/watch?v=lD8QNQATrNs
SOURCE: Rear differential driveshaft seal leak.
Hello,you need to remove driveshaft to be able to get to the nut.Remove the nut (MAY BE VERY TIGHT) and pull the yoke or flange as you called it out & you can pop old seal out & new seal in.You may want to smear a tiny bit of grease or vasoline on outside of seal for easier installation & also on the rubber part of seal so itwon't get damaged when you re-install the yoke.Hope this helps.
SOURCE: 2001 Silverado 1500 Z71 4x4 oil leak
i had the same problem and it turned out to be the gasket on the rear main seal housing not the rear main seal.
SOURCE: The rear axel seals on my 2002 Chev Silverado
there is a problem with the axle or the axle bearings, If you replace the bearings the problem will usually stop.
SOURCE: torque specs on Chevy Silverado 2500 rear diff yoke.
There isn't a torque spec since those bearing are pre-loaded. You place the unit on a good known vic and get a breaker bar and you might even have to put an extention on that and you begin to tighten unitil you fell the bearing start to load...a little extra short turn wouldn't hurt at that point.
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