I jack up my machine to shine the tires all the way around and I turned the front left wheel backwards and the diff made a terrible grinding sound like when you loosen a rusty old bolt with stripped threads and the whole machine would vibrate, is this normal? I never hear it while its driving on its own. Could there be sand or something in the oil cause I’d hate to have to take off my bumper/chainsaw mount/winch mount and zipties to look.

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