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This the rear under my 1984 F-250. See Sig for more info.
I don't see any tags or anything stamped on the axle anywhere. It may be covered in rust or mud, but I can't find it...
Looks to be a D60. Take a wire brush and clean the webbing above the rear cover, I believe the right hand side but possibly the left. If it's a D60 it will have a "60" cast into the webbing.
There is no tag on there and I can't see any numbers stamped into the housing anywhere. I must've gotten a freak axle where they forgot to stamp it or something...
The tags are sometimes missing since they're held on with the diff cover bolts. A lot of times people will pull the cover and forget to replace the tag when they reinstall it.