Hi... I have come across a 12-bolt differential for a 68 Camino project I am working on. I'm having trouble de-coding the thing as to ratio,proper date and the like. I am especially not sure of the "K" that shows up at the end of the script and what year it may pertain to.

The numbers are in this order and position on the axle.

CH 0311 k
E

The axle casting number is 3959038 and currently has a 4:56 gearset in it. Thank you in advance for any direction or assistance you can provide. Glenn