I picked up a 75 620 that has been converted to 4x4 by a dealer back in the day out of Oregon. I have figured out from research that the front axle is a Dana 30 with the stock 620 brakes. The transfer case is a Divorced Dana 20. I was in the process of changing all the fluids out to 80w90 Lucas and when I drained the Transfer Case it was ATF. I have done some searches and have found that most use Gear Oil and then some use ATF. Some have even said that an aluminum case uses ATF and that Gears use ATF but a Chain drive uses Gear Oil.
I have tried the search function on here and it says that it is not supported, not sure what that means so here I am with this post.
So the question is WHAT KIND OF FLUID DOES THE DIVORCED DANA 20 TAKE and how much????