Is the cut in the tread or the sidewall?
If the cut is no deeper than the tread I’d drive it and never worry about it. If the cut goes below the tread I’d check to see if it has exposed cords in which case the tire is garbage. You’d have to get right in there with a prying device and a good light to see how deep the cut really is.
If money is no object I’d put 4 tires on it.
If money is tight I’d buy two tires and install them on the rear but not use 4x4 in high traction situations over long distance.
If you’re broke buy a used tire of the same size and wear.
Significantly mismatched tires on the rear will destroy your diff in short order.
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