depressing newbe question of the day

grumpuscreature said
The last picture is your problem. If the rear u joint comes loose, it will beat the crap out of the bottom of the car before it flies out into traffic. Most embarrassing.

well your right about that being the problem, I stuck a bolt in there and went for test drive.

on mashing pedal, I hear no or little noise, I suppose if that bolt were all the way in, it would consistently be quite.
I'm a bit embarrassed/ and mad about stripping it :<
but happy as hell to know what the problem is.

so now I just need to figure out what to do with it now that its a bit stripped, suggestions PLEASE.. do I need a new differential/rear?

pics....
can you identify my rear type from these pics?

new bolt, as tight as i could grrrr

so glad I identified problem, Thanks for the help guys