I just got done going through a auto trans from a 54 Merc, but I am transplanting the trans into a 54 Ford. The number on the tag is IP-7003-E. I needed to borrow a couple of the lines out of another auto trans that came out of a 55 Ford. The number on this trans is PAK-7003-D2. The tubes that I needed were completely different from one another. The tube from the IP trans is a 1/2 inch and is U shaped, and the other is U shaped 1/4 inch. The tubes and valve body in the PAK trans are completely different. Were there major changes between 1954, and 1955?