At least 200K miles( YMMV :winking. I replaced my D50 axle that had problems with a new 04 D60 takeout. I've had the axle shafts out of that one at least once, and the axle seals (just outboard of the differential) are still fine. I leave my hubs locked all winter, as well.I have a question about my Dana 60 oil seals. I didn’t have any oil in the axle tubes until I pulled the axle out of the carrier (low side on stands)
How long (Miles) do these seals normally last before needing replacement?
Be advised that the standard C-clamp style ball joint/u-joint press won't work on them. The cups are too large to fit in the hole in the press, and putting any rings in will make the clamp too small to fit around the yoke. A hydraulic shop press will be needed.