I have a problem that needs your help!!!!!!!!! I am looking at purchasing a powerglide that is supposed to be a 67. Problem is this, no where on the tranny pan can we find any numbers what so ever. I did find these numbers on the inside of the bell housing where the Torque conmverter is placed. B 7 4. Anyone have a clue what these numbers mean??? Is it odd not to find any numbers at all on the tranny pan? maybe this tranny had it's pan replaced, but would there not be some type of Identification for this? We scrubbed the whole pan clean and could not find anything.