Later models, like mine, went back to grease, so I'm not 100% sure. If you take of the decorative hub cap, there should be a clear window in the centre of the hub, I think the level should show on it. Hopefully someone with oil bath hubs will chip in.
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WillyM
2015 MS 38RSSA. 09 Ram Dually Diesel, 68RFE, 4.10.
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