I'm not sure on the gear ratios, but the 1972 rearends are 2 inches longer than on the 1960-66 trucks (1 inch longer at each end).
David
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*1962 C10 swb fleetside, big window, custom cab 350/TH350 combo...Hot Rod
*1963 C10 lwb fleetside, small window 230/4 speed...Blvd Cruiser
*1931 Ford 5 window coupe (soon to be Hot Rod)... Father & Son project
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