Try a local transmission rebuilder. Most of them will have a bin full of trashed-out parts for just such scavenging. The TH-350 is getting old enough that lots of shops don't even bother rebuilding them anymore, so they might have a complete transmission you can pick up for scrap value.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!