Tranny pan gaskets also leak if overtightened. No more than about 6-8 lbs. of torque on the tranny pan bolts. Gasket may simply be worn as well.

Also consider Lenny's comment. Test tranny fluid level on flat surface with motor running AFTER you drive it at least 20 miles. It takes a good bit of driving to warm up tarnny fluid sufficiently to test it's level.

My 2 cents.

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'91 300-SEL