You didn't mention if you have a 2.3 or a 2.6. On my 2.3 the hose at the rear of the head on the drivers side became soft and started leaking. You might want to check it...it could be trickling down the bell housing and dripping from the transmission.

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible