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9 Inch Rear Differential

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The Bronco came stock with a Ford 9-inch rearend, but this particular 9-inch was built by JSA Off-Road Center in El Cajon, California. Thirty-one-spline Superior axles replace the weak-ish 28-spline stockers and plug into the sure-footed grip of a Detroit Locker. The 35-inch Goodyear MT/Rs are spun by a set of 4.11 gears.