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The inner bearing is usually larger for the 3/4 ton. Are they 'bolt-on' locking hubs? In 77 or 78 when GM went to the 10 bolt they used the same spindle for both.At that time they aslo used the same locking hub which had the internal spline in the rotor assy. The 3/4 spindle from 73-76 took an inner bearing of 362 [i think]
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