My '52 model 470 series GMC 3 1/2 ton is 78"in. from front tire sidewall to sidewall. Rear tires were 91"in. sidewall to sidewall. Front fenders looked to measure 84"in. wheelwell lip, to wheelwell lip. These Heavy Duty GMC's have wider wheelbases than the 1 1/2, & 2 ton Chevrolets, & Medium Duty GMC's.