Details

• Brand:

  

  

• SKU:

  PC3Z-4209-F

• Positions: Rear
• Other Names:

  Ring & Pinion, Gear And Pinion Assembly Driving

• Description:

  This is the genuine Ford differential ring and pinion gear assembly, the matched hypoid gear pair that turns the driveshaft's rotation ninety degrees into axle-shaft rotation while multiplying torque at the final drive ratio. Ring gears and pinions are lapped together as a matched set at the factory and must always be replaced together, never individually, because their tooth contact pattern is unique to the pair. Verified fitment is the 2023 through 2025 Ford Super Duty F-450 and F-550 with dual rear wheels, and the catalog specification for this suffix is an 11.80 inch ring gear with a 4.30 final drive ratio, so both the ring gear diameter and the ratio must be confirmed against the axle tag and the vehicle's build before ordering, since sibling suffixes in this base cover other diameters and ratios. The Ford catalog name is Gear and Pinion Assembly Driving, listed by dealers as Differential Ring and Pinion. Symptoms that lead a truck here are a howl or whine from the rear axle that changes with load rather than road speed, a clunk on throttle transitions from excessive backlash, metallic glitter or chipped tooth fragments found in the axle lubricant, or gear teeth that have spalled or broken from heavy towing, an overheated axle, or a run-low lubricant condition. Installation is a precision job requiring setup bearings, a dial indicator, and a press: pinion depth, bearing preload, and backlash must be set and the tooth contact pattern verified before final assembly, and a new crush sleeve, pinion seal, and the correct axle lubricant with any specified friction modifier are mandatory.

• Applications: 11.80, 12.40 REAR AXLE.

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