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Not sure on the Ford trucks but the cars were 5 on 4.5 as the Mopars were. GM's were 5 on 4.75. When everyone started going FWD is when things got mixed up.

Depends What cars. Some of the Big 70s models had the 5x5"(aswell as Chevys Big cars) but was only a select few. Ford 30s and 40s were 5x5.5" also.