Details

• Brand:

  

  

• SKU:

  ML3Z-4209-F

• Positions: Rear
• Other Names:

  Differential Ring And Pinion, Pinion Gear, Gear And Pinion Assembly Driving

• Description:

  This Genuine Ford ML3Z-4209-F is the 9.75-inch ring and pinion gear set in the 3.73 final-drive ratio for 15-25 F-150, Expedition, Navigator, Transit-150, Transit-250, Transit-350, and Transit-350HD applications equipped with Limited Slip or Positraction differentials. The hypoid gear set transfers torque from the driveshaft pinion to the carrier-mounted ring gear, converting input rotation to the wheels at the 3.73 to 1 reduction ratio that balances acceleration response with highway cruising RPM and fuel economy. The matched ring-pinion set ships as a lapped pair and must be installed together since pinions cannot be substituted between sets. Owners replace this gear set when a complete center-section rebuild is required after carrier or bearing failure, when a gear ratio swap is needed to match larger tires or heavier towing duty, when severe whine or growl indicates worn or scored gear teeth, or when off-road impact damage chips or fractures a tooth. Installation requires a complete differential disassembly, new pinion crush sleeve, new pinion seal, new carrier and pinion bearings, and a precise ring-pinion mesh pattern set with the proper backlash spec. Verify exact ratio and axle size by VIN before ordering since multiple ratios are offered on this axle.

• Applications: TRANSIT. 9.75 Axle. W/LIMITED SLIP.
• Replaces:

  FL3Z4209D, FL3Z4209G, ML3Z4209D

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