Info needed: 1967 M38A1 Lubrication?

[rob love]

Well you made me have to stand up and reach onto the book shelf over the computer.

My operator manual shows 1 quart. That will be imperial so bigger than a US quart or a liter.

Quite frankly, fill the differential until it is one knuckle below the filler hole. Same goes for transmission and transfer case. If you reach your finger into the hole and bend the first digit down, it should just be picking up the oil. Also, service the little breather valve on top of the diffs. You simply give it a couple twists to dislodge any dirt that has attached itself to the oil vapour and can plug up the valve.