The larger diameter tire will make your speedometer and odometer even more inaccurate.
Since these old timers are so slow anyway I don't think it makes much difference, just get the tires you want then worry about the calibration.
'31 Chevy 1 1/2 ton,
'42 GMC 2 1/2 ton 6x4,
'52 GMC 2 1/2 ton 6x6,
'53 GMC 5 ton
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