Nope, that close ratio trans is a Borg-Warner, not a GM corporate box (Muncie). Virtually nothing interchanges, but the B-W box is worth about 3 times what a SM-318 is to the right buyer.
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!