Originally Posted by Nightcrawler
Yes there is a seal. Mine leaks slightly. I have the new seal but couldn't get the nut undone. You have to take the prop shaft off. Mark the nut & threads then undo the big nut. When I tried I ended up just moving the truck by turning the nut. I still have to do this job, but will have a go next year now as it don't leak to bad.
what seal are you talking about?
to op, I think some sell a gasket for the rear diff but trust me you are better off using black rtv sealant. The gaskets have been known to leak where the rtv doesn't.