That is the normal practice, however I recently did the fluids in my car & the manufactured recommended rear end level was 1/2" below the fill hole. I am assuming this is for your Workhorse Chassis as you don't say in your post. There should be some info online if you search for it.
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Dan Sees, , 2013 Winnebago Journey 42e, 2014 Featherlite Car Hauler 3110 17.5', 2008 Mazda MX5,
2008 Toyota FJ Cruiser,2018 mercedes Benz GLA 250
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