I was wondering if you can remove and replace the Bell housins on the 4T60 and 4T65 transmissions...

Nope -- it'* all one unit, bell housing and transmission.

Welll, transmission isnt worth keeping then, it broke where the from mount connected.

http://www.d3bug.net/riviera/pages/P1010038.htm

Its the front dogbone, there is a good picture of it there. Also I noticed last night when I got the engine out and I was cleaning up that the cap for the extension housing where the differential is is broken all the away around.

The swap seems to be easy, according to some fiero guys I can use the same harness and pcm in the car. I guess in alot of fiero swaps they use series 1 harness and pcm so they dont get error codes for the tranny.