Sorry it has taken me a couple days to follow up. By the time I get home and take care of family duties I'm lucky to get 20 minutes out in the garage working by flashlight.

I called Doctor Diff prior to pulling the axle out. The setup uses the black axles he sells that take tapered bearings that are lubed via the gear oil. No inner axle seals. Cass thought that maybe the shop boogered the seal when putting it together. Now that I got the axle out up on the bench in decent light the seal looks to be OK.

What I did notice is that there is no gasket on the housing end.

That is as far as I got. I'll update the thread when I get back out to the garage.