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why would trans fluid be behind the l.f. tire? do you have power steering? it uses type F fluid just like the trans.
Make very certain that your leak is not from the transmission VENT TUBE! After sitting the converter will bleed down causing an overfull condition and the excess fluid will be forced out the top of the tranny through the vent tube, run down the side of the transmission and along the seam between the case and the pan giving the appearance that the pan gasket is leaking If you can, hook a rubber or plastic tube on the open end of the vent tube extending it past the pan gasket area. Clean up the previous leak and refill the transmission and run your car for a bit, you can then tell where the fluid is actually leaking. It may be some time before it leaks fluid again which is a very good indication it was coming out the vent. I chased a pan leak for years with the same symptoms you are experiencing only to finally figure out it was not the pan. This overflow looks exactly as if the transmission pan is leaking and it takes weeks or more for it to start when a car is not driven. Just one persons long journey to a car that doesn't leak. Good luck. If the overflow is a problem the only cure seems to run the car more often.