Must be a truck because the car 12 bolt didn't come out until '65. Remove the cover and count the teeth on the ring gear and the pinion gear. Divide the number on the ring gear by the number on the pinion gear. 41/11=3.73 Probably needs an oil change anyway.
If this is a truck 12 bolt with 3.73 gears then you also have a 4 series differential. I don't know what you have planned, but that is something that you will need to know if you are going to do a gear swap.
If you are planning on going to something like a 3.42 or 3.07 gear then you will need a 3 series differential. Those gears won't fit the 4 series that you have now.
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