Tough call whether to rebuild or put a used one in. The rebuilt
trannys are frequently unreliable. I assume that your '93 has a
3-speed auto, you'd probably have better luck rebuilding, while the
later 4-speed autos are a lot more complicated.

If you put in a used one, it could fail anytime, or give a few years of
good service. On the other hand, if yours is *correctly* rebuilt, it
will far outlast a used one.

I'd say rebuild a 3-speed, but only if you can find a shop with a
sterling reputation for good work. Ask everybody you know, check the
Better Business Bureau, etc. This is a very technical job and
everything is hidden. An unscrupulous shop can tell you that you need
a new torque converter, for example, AFTER they've torn everything
apart. And how are you to know differently, even when they don't
replace it? And if they don't get it done right, they can goof around
with the car for 7 weeks without being willing to drop the tranny and
start over (my personal experience in fact).

What ever you do, charge the repairs to a credit card, begged,
borrowed, or stolen, so you can dispute the charge if you don't get
proper service. It's the only reason I wasn't out $800 myself, while I
was unemployed to boot.