Differential fluid

JoeIH

New member
I'm using the axles off a 71 1210 to put on my 68 1200C. I have a Dana 60 rear end. Can someone tell me what differential fluid I'm going to need as I am changing it. Thank you.
 
Basic 90 weight gear oil. If it has a limited slip in it, then you will also need Limited-Slip additive.
 
A follow up to my first question. My axle is off the truck so I jack it up and set it on blocks. I spun one tire and it moved freely but the other tire didn't move at all. I did the same to the other tire and the same thing happened, the tire I wasn't spinning didn't move. Is this what you would call an open differential?
 
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