12-Bolt Chevy vs. 9-inch Ford: Which is Better?
On 4.10:1-and-up ratios, the Ford pinion’s tooth-end becomes progressively more massive. Compare the U.S. Gear Ford 4.11:1 pinion (left) with the Chevy 4.10 (right). With no diff case breaks, there’s more room for aftermarket 9-inch gearset makers to increase pinion size. View Related Article
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