What fluid in the differential of a 1989 78-passenger BlueBird All-American
So, I sheared off an axle, and found a replacement, but it is sitting on a bit of an incline, with that axle downhill, so I've lost probably 3/4 of the fluid out of the diff. What fluid do I add, and should I drain it completely and put in all fresh?
I've looked around, and found a tag on the diff that's hard to read, but I can make out "Rockwell International", and the model looks like it might read R 125NX 7
Thanks
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