leaking from bellhousing

Check for a loose filter (they can suck air and aerate the fluid making it vent foam)
Make sure it's not majorly overfilled.

Then it's a pull.

If the seal happend to pop out they can be locktighted in place, but still replace it so it has the new resistance going in.
Grease the inside of the seal lip where the spring is to help keep the spring from popping off when the converter goes in.
(this could be why it leaks now)

If it's loose pump bolts you really need to replace the gasket.
It's too risky to have it out and not do it.