I have just been through this had the trans out 4 times, replaced pump bushing and seal, replace bushing and seal again, replaced pump, installed tracer dye, pulled apart, and found it leaking from pump seal again , pressure test converter, found my leak! weld at snout to converter, so it always looked like front seal. Optimistic thinking would be if you filled your converter and some drained as you installed it in the transmission and dripped out as you ran it. Clean it with brake clean and blow it dry and see it leaks again.