I only recently learned about this one... and then actually picked up an 18-spline A-833 that confirms that this is possible:

My tranny has NO serial number... the boss where it would normally be stamped is completely blank... moreover, this boss has not even been machined smooth - it has the same cast sort of surface as the rest of the iron case.

~ How can this be...?


Let's see how many guesses it takes before we have a winner with the correct answer - which I promise is the gospel truth.


- Alan