Third member casting number

Chuck, In my opinion that would just be too early for anything other than maybe a first production 64 1/2 Kars. In my eyes it would even be too early for those as Ford used this casting in so many cars that they were constantly being produced and used just like standard engine blocks and heads. I would put date codes for rear end castings in the same time frame category as we put blocks and heads with scheduled production dates of the cars.

-Fred-