Here's some #'s on it: Bellhousing 355-3 Tailshaft 3681191 and 05305 below it and 13 to the right of both #'s...Perhaps someone can help me decode this as I'm now not convinced it's for a BB as it's very similar in dimensions the my other 727 tranny mated to my 340... I'm sure someone out there can set me straight! Cheers!