this doesnt look normal to me does anybody have a clue why there is a black fluid coming from my diff mount ? Attached is a pic of what my Z is doing

 

It is an-oil-filled bushing and yours is now blown. There are several aftermarket replacement bushings available so just search the forum for your options.

 

Had the same issue, it will progressively get worse causing unwanted vibrations and clunking.
I went with whiteline bushings which are polyurethane or you can get slp solid bushings.

 

^ +1 w Sxexcx

search rear differential bushing.

SPL makes a solid, whiteline or energy suspension makes a poly sandwhich replacement.

if you find anything else leaking like that, its the clap.. youll need a week of strong antibiotics.

 

Thanks for the help guys. I saw this earlier today and i was beyond stumped. i didnt know it was an oil bushing, whoopsies. I'm probably going to buy the whiteline kit. Unless anyone knows of a better option that is less expensive.