Well, I have personal experience on the V6
so, look it em, or post pics, the passenger side one is a 'donut', is the bolt centered or dropped? Dropped-replace, easy, can also do a timing belt.
Front AND back, centered, are they leaking? Are the vacuum lines attached? Temporarily, stick on a new vac hose, like 5' long, -SUCK- -HARD- pull any air? Yup... Replace...Difficult
Trans, doesn't seem to matter too much, if somehow it has collapsed, I'd be amazed, might as well post a pic if it is dead.
Also, for an easy check-up, look at the engine while running, is it rough at idle?