I suspected a leak after noticing a tiny puddle under my 300SD in a parking garage last night. I placed cardboard under the car when I got home, and this morning there was a lot of ATF on the cardboard, the puddle was maybe 4" x 2". This transmission has over 250K on it and I know that it will need to be resealed and possibly overhauled because it takes a full second to engage into R or D . The transmission shifts flawlessly, so getting it rebuilt seems a little premature. I have another transmission sitting in my garage that used to work very well until I tried to change the front seal on it. Afterwards, the car wouldn't shift out of first. I definitely need to go to a pro this time around.

Is there an additive that someone could recommend that might buy me a little time. I serviced the transmission 20k miles ago and I know that the pan gasket is not the issue. The leak appears to be coming from underneath the bell housing, so I'm assuming that it the front seal.

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'81 300SD