Where is the pinion seal and how do I tighten it on 1998 Dodge Durango

All I know is its in the rear axl

Asked by for the 1998 Dodge Durango
It needs to be replaced. Little more than a diy project. Have it done! Now, If you were told the seal is leaking 'because' the pinion itself is loose, that is another problem altogether!! Any noise from rear end?
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do not do this yourself or you will be sorry