c4/c5 trans.......need help??

[sn95gt19]

there was a thread on this a while ago, but i couldnt find it.

my ? is what are the differences between the c4 and c5 auto's. i already have a c5 out of my 86-3.8 cougar, and i am going to have it rebuilt with kevlar bands, hardened shaft, servo, manual valve body w/brake, and a new planetary gear.

will a c4 bellhousing bolt up to the c5?
are the cases the same?
will the parts interchange?


thanks