http://www.hotrodders.com click on :
knowledge base
and browse around... lots and lots of information and links to articles about all kinds of stuff.
for transmission stuff, look for 4x4 and off road type sites, you can usually find a lot of information about most truck trannies through those peoples.. since they like to switcha nd swap everything around to fit the project at hand.
http://www.jalopyjournal.com - click on the 'hamb'... poke around in there, if you join, be sure to introduce yourself, friendly folks as long as you follow the board rules.
the publications page has good stuff on it as well...
-W