'63 Valiant Newbie

(Yes, the engine was rebuilt - two years ago. More about that in a later post.)

The hauler warned me that the car was dripping oil - when the trailer arrived, I could see it dripping every 7-8 seconds from the bell housing (the car, still on the trailer, had its nose in the air). I put oil in it, seeing that nothing registered on the dipstick. I'm assuming that either the pan is loose, or (*gulp*) it's got a defective or improperly installed rear main seal.

I've got a trusted mechanic with a lift. If push comes to shove, and it needs a new seal - can it be replaced without pulling the engine, or the trans?

adTHANKSvance,
Dan