So I dont know a lot about the transmission on the 300D but I do know that it has a leak when it gets warm outside. My first reaction is to go ahed and drain the fluid and replace the gasket and the filter but wanted to make sure that there wasnt anything I was overlooking.

First the leak is comming from the drivers side about half way down the pan. There seems to be some sort of electrical pin connector with the different positions of the gears (i.e. P R N D S L PIN, this is exactly what it says on it) which the leak seems to be comming from above this.

Also the leak only has happened as it is getting warmer outside. I noticed the leak yesterday and checking last night after driving it when it was raining the leak seem to have stop. I pulled it in the garage and wiped off all the water on the underside of the trans. and noticed that there wasnt any fluid leaking.

My question is that on this side of the trans, is there anything else that I need to check for leaks besides the gasket??

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1980 300D European
"The Red Fox"
200,000 miles

2003 Chevrolet Silverado

609 Certification

If it is a rubber gasket or grommet... you might be ahead of the game by just installing a can of the Trans-X tuneup/Stopleak...
the way those types of stopleak work is that they swell some types of rubber gaskets... cheap try compared to anything else I know of.. particularly since the amount leaking makes it sound like it just started....