cars is a 91 rs with 3.1 and 4 speed auto with OD the rear end has gunk all over it like its leaking and just sticking to the rear end but it never drips or anything? could this be the gasket to the bellhousing or a hose or something maybe/

 

maybe give that area of the rear end a good cleaning and see where if any leak there might be.

it could just be years of build up and might just need a good cleaning.