Do the numbers on the very top's flat spot mean anything like a VIN number?  The higher the number, the newer the transmission?  I'm taking two to my transmission friend for him to look inside and tell me which one to use so it's more of a curiosity thing to me.

 

The highest number

 

The other one

 

4spd far left, highest 5spd then lower number 5spd far right

 

Thanks for any replies,

Cliff

We had a big discussion about this quite a while ago.  There's internet stuff that says the numbers mean something but when you compare the numbers with known facts about the transmissions, like year of car they came in, there doesn't appear to be any usable correlation.  

 

You can tell a lot just by the gear ratios.