agro1 - from what you say, it sounds like the tailshaft housing took the bump?
No big deal to take that off and reseal it, from memory I don't think tremec use gaskets, just some red gasket goo stuff. If you have the space, you might be able to leave the box in situ and just remove the tailshaft housing.
If you look at
www.cobralads.com , in fact go to
http://www.cobralads.com/butcher56.html Andy did take his tremec apart, and there are some pictures. Also there is a link there to get you a tremec service manual.
BTW - if that "ear" that hit the ground is the one underneath the shifter tower, then there is nothing to stop you sawing it off. I cut mine off to clear a chassis cross-member. It is just an alternate mounting flange used on some OE application. I am sure there are some pictures of that here on CC - try searching under "tremec".
Turk - toploader case is cast iron, tremec case is aloominum. Neither is designed to be used as a bump stop. Ground clearance is a wonderful thing, but you should not have any problems with your car? Since the chassis is the same as mine in most respects? And I got plenty of ground clearance. In fact, from memory, sump/bellhousing/gearbox are all pretty much protected by the chassis rails.
Of course, I didn't have to lower everything to make room for a fat block.