Carl is right on tire size. My truck has the 20" tires and an 18" spare. The sidewall of the spare is taller making the outside diameter of both tires basically the same. That way all Ford Super Duty trucks have the same spare regardless of the trim package.
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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