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 Hollander interchange No. 530 tells us that Chevy and GMC 1/2-ton, 3/4-ton, and 1-ton trucks (except four-wheel drive) share this same steering gear. The earlier ’56 and ’55 second-series trucks used a flat (rather than dished) steering wheel, so their shafts are slightly longer. Either way, you gain a self-canceling turn signal switch.