My 89 300TE is leaking ATF from the rear of the transmission. The driveshaft is spinning it up onto the undercarriage. I noticed this when recently replacing the shifter bushings. I could see a band of ATF on the undercarriage above where the driveshaft meets the tranny.

How do I confirm the source of the leak is the rear tranny seal, and what is involved in replacing it?

Thanks,
Robert

__________________
89 300te 222,222
92 300e 190,000