Hello Dave, welcome to the forum

I got a small slide hammer with a screw
the fits on the end, like the ones you
would use to pull out body dents,
take that and either drill a small pilot
hole, about 1/16" or if the seal has a
groove around it like my trans had and
screw that thing in, now wack it with the
slide hammer and it should pop right out

Good Luck
Darrin