there seems to be a very very slow sippage near or around the joint where the torque converter mates to the transmission. The area is very grease and dirty, lately, I can see a very small drop of oil under the driver's side near the torque converter. What should I do? The tranny fluid level is fine, spot on.

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98 ML320 (gone but not forgotten)

and the leak seems to be coming from where the transmission mates to the engine. What I don't get is the little bit of oil on the ground does not have any tint of pinkish red color. I looked at the steering rack while under there, don't see any leak from the rack.
Judging from the EPC and WIS, there seems to have no gasket of any kind where the tranny mates to the engine. The bolts are tight and I don't know if there is any fix to this.

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98 ML320 (gone but not forgotten)