OC 4 Transmission case date codes

[Robert Barbour]

I have collected the remains of 4 OC 4's and now have enough to build one, an OC 46 loader.

Two of the transmission cases which I believe are the older ones have casting number 221463,
one has C LU K0 under it and the other has E E K0.  I think these are date codes. does anyone have an idea on how to read them.  These had differential steering units installed in them.

The other two with spot turn units have casting number 223660 or it might be 223880. One has G C EA under it and the other has nothing!  Does anyone know if the spot turn unit will fit in the older case??