My understanding is that the cork gets pinched in between the two tabs of the washer and the seal. That is the way I have been doing it for the past 40 years. The corks are not tapered on either end. I have dozens in their packages at work, so these are factory design originals as opposed to the cut valve covers.
Edited to add: Grant, I checked the MLVW manual and the illustration you have is wrong. The cork goes in between the seal's tab and the tab washers inner tab.
Not sure the Chev ever had the cork, but it would help if the truck for some reason leaned enough to let the oil get in to the top of the spindle, or was splashing it to the point of putting oil onto the top of the adjusting nuts.
In Jordans case, we were having email discussion on this, and he had filled his diff to the edge of the filler hole. Normally you go one knuckle lower to allow for expansion, and even a half inch lower won't hurt, but will help prevent leaks. And of course, the breather valve must be clean.
Last edited by rob love; 03-09-21 at 21:45.
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