Try Technical Video at 1-888-785-2604. They
are $34.95 ea.+ $3.95 S&H. See their ad in
Feb. 01 Car Craft and other mags. A friend
used one of their videos to rebuild a C-6
and he said it was easy to understand and the
transmission worked OK, too.
I have one for 2004R from Technical Video and think it is well worth the cost. Especially if you are new to the auto trans rebuilding. It shows a "typical" teardown and assembly. It does not show any performance modifications.