I had my front transmission seal replaced about 15 months ago when I
discovered dripping from the transmission/torque converter housing (about 1
drop/day). At the time, the mechanic told me it was risky because the leak
could either be from the front seal, or the torque converter itself and they
couldn't guarantee success after changing the seal.

Nonetheless I went ahead with the work and the leak was eliminated and all
has been fine until about 2 months ago when I spotted a drop on pavement of
the driveway under the same location. When I looked, I saw the same area wet
with a drop hanging as originally seen. When I then checked the transmission
fluid level (which I hadn't done since the work; dumb, I know) I saw that it
had been overfilled, and I'd been driving that way since I had the front seal
replaced about a year before, so I siphoned out about 2.5 quarts of fluid,
added a bottle of Lucas (hoping the leak was from the "new" front seal I'd
previously replaced and that Lucas might help a little) plus 1/2 quart of new
transmission fluid to bring my level up to "normal" in the cross-hatch area.

As of now, I'm still getting the 1-2 drops per 24 hour period from the
transmission housing.

Is it likely that driving around for 12 months with the overfilled tranny
applied too much pressure and foobar'd the "new" front-seal I'd replaced 15
months ago causing it to leak?

TIA