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I have a 1973 F600 and I'm unsure which plug to fill the rear differential to. There are 3 plugs on the back side, I assume I would fill to the lower or mid part of the axle. See image attached.
Thanks!
Notes 5 & 6 cover all the Eaton MD axles, but I'm not sure yours is an Eaton or a Rockwell, and I can't tell from the pics in the MPC. If you post a clear picture of the warranty plate, riveted on the driver's door below the latch, I can look up what axle it left the factory with.
I found what I was looking for (ref. https://www.ford-trucks.com/forums/1...post21564463): the two upper plugs are for mounting an external oil filter to Eaton rear axles. Apparently, this external filter setup was optional only for the Eaton 16244.
So you can probably ignore the two upper plugs. It looks like a good option to have; I've never seen one. My truck has the 16244 axle as well.
[later]
This filter setup is not shown in the 80/89 MPC, and an '84 F700 version has no plugs in the diff housing:
And when you look up the filter element in the 73/79 MPC you're given C8TZ-4A318-A replaced by 87675-S:
which is a plug:
So, you may have had an external oil filter which was replaced by plugs, or plugs from the factory.
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