True Hi9 Ford 9-inch Axle - Bulletproof Axle
In addition to the obvious difference in pinion location, the True Hi9 third member also has significantly more ribbing and is thicker where the pinion support bolts to the third member. A fine-thread adjuster is threaded into the case that rests against the ring gear to keep it from deflecting under load. No other high-pinion differential offers this thrust block.
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