I have a 1985 corvette and after the car sits for a few days, it will leak tranmission fluid.
transmission leaking fluid on 1990 Chevrolet Corvette
check the seals for the transmission also the oil pan gasket for the transmission
After a few days the converter will start to drain fluid back into the pan. If the dip stick tube seal fails it will leak out. Replace the dip stick tube seal. Good Luck