Leaky rear end

[Beast2009]

Hey everyone! I'm new here. I have a 1973 3/4 ton beast and Im on the 2nd rear end. We replaced it once already because the axle leaked and we couldn't get it to stop. Replaced that rear end and its doing it again. The truck has sat for quite some time now and has been leaking. Is this a common problem for the 3/4 ton?

 

[PrairieDrifter]

Pinion seals or axle seals? Or diff cover seal?

 

[gpmorgan]

Make sure the vent tube is not clogged causing internal pressure.

 

[jt1200r]

see your proctoligist