so - is it leaking from the seal around the torque convertor, and into the bell housing/dust cover area ? or is it leaking from the pan gasket ?
if its coming from the front seal, then you'd have to drop the trans, remove torque converter, etc. i don't know about you, but it'd have to be pretty serious leak for me to do this.
as far as fluid on the dust cover, are you sure its trans fluid. leaking rear main will put oil in that same spot. that can be changed by dropping oil pan.