"Casey Stamper" wrote in message:
snipped
What am I missing? I don't see any screws or flanges
or anything obvious that might need to be loosened or removed before
separating the pan from the drain assembly.

Depending on the type of drain - the joint could possibly be a poured lead
joint. This would be where the drain pipe has had oakum packed in between
the pipe and the drain body and packed tight. The oakum is actually the
seal. The lead is poured over the oakum and "caulked" in place (caulked
being a term used to pound the lead evenly over the oakum - not the stuff
from a tube.) You can remove the lead with a torch if the drain pipe isn't
PVC - but it's a bit tricky if you've never done it before. I believe (if
this is your problem) that your best bet would be to get yourself a small
(1/4") cold chisel and be sure it has a decent bevel on it. Begin
chiselling at about a 45° angle on the lead - peeling it off. It won't be
an easy job - but it will save your having to replace the piping. Keep in
mind - this is *IF* it's a poured lead joint.

Let us know what you find out.

Jim