[BlackHemi41]

Need a better picture to see the source of the leak. Is it coming from the axle seals? Did you happen to hit the seals with the axle shafts when you were installing?

 

[BlackHemi41]

Yep. There is an axle seal saver special tool for those. A shield that goes around it while you slide the axle in.

10270, Protector, Half Shaft, Drive - Mopar Essential Tools and Service Equipment

moparessentialtools.com

If you do it without that, you have to be reeeaallly careful. Sh#t happens

 

[BlackHemi41]

I purchased a rear-end (pumpkin only) from a salvage yard a while back and paid a guy to swap it into my Charger, and one of the axle seals leaks. I just figured it was already leaking and just continues now that it’s in my car. But after reading this thread, I’m now wondering if the leak was created at install time.

My scenario differs from the OP’s in a couple different ways:
1) mine is an open diff, not an LSD.
2) mine is not a ZF like the one pictured, it is an old Mercedes unit or whatever they used in the pre-ZF years.

Do either of those matter with respects to the procedure you describe and the special tool you screenshot?

I don't want to put fingers at anyone, but it's a possibility. It's a different tool for the older style diffs: 9099A, Seal Protector, Differential Output - Mopar Essential Tools and Service Equipment but same thing applies.

Part of the issue is how awkward the angle is on the inner CV joint, if you're installing the diff up into the car with the axles already in the hub bearings. It would be an easy mistake to nick the seal with the splines.