Help keep differential lubricant in and road grime out with the Schaeffler Differential Pinion Seal / Shaft Seal, part number SS6405. Cataloged for the rear differential, it is a direct-fit replacement for the listed applications on the 2011-2019 Ford F-250 Super Duty and 2011-2019 Ford F-350 Super Duty. Schaeffler lists this part as a shaft seal, and it is cataloged here as a differential pinion seal, so you may see it under both names.
The seal stays stationary in the differential housing while the rotating pinion assembly turns within it. It closes off the pinion opening in the housing, helping hold lubricant in and keep dirt, dust, and moisture out.
- OEM standards: Designed and produced to stringent OEM standards for assured quality.
- Quality assurance: Backed by a robust quality assurance process that accounts for the precise requirements of automotive systems.
- Premium materials: Built from high-quality materials so the seal stays durable and effective at providing protection over time.
- Contamination protection: Helps keep dirt, dust, and moisture away from the components it seals.
Signs this seal may need replacing: Lubricant seeping or dripping from the front of the rear differential where the driveshaft connects, a wet, grime-covered area around the pinion, or a low differential fluid level. Diagnose the source of any leak before replacing parts.
Fits: 2011-2019 Ford F-250 Super Duty; 2011-2019 Ford F-350 Super Duty. See the "Vehicles it fits" section for engine and configuration details.
Interchange: 20042A · 4136405100
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Frequently Asked Questions
What does the Schaeffler SS6405 seal do?
It seals the pinion opening in the rear differential housing. The seal stays stationary while the pinion assembly turns, helping keep lubricant in and dirt, dust, and moisture out.
Which vehicles does the SS6405 fit?
It is listed for the rear differential on the 2011-2019 Ford F-250 Super Duty and 2011-2019 Ford F-350 Super Duty. See the "Vehicles it fits" section for engine and configuration details.
Is this a differential pinion seal or a shaft seal?
Both names apply. Schaeffler describes SS6405 as a shaft seal, and it is cataloged here as a differential pinion seal for the rear differential.
What are signs a rear differential pinion seal may need replacing?
Common signs include lubricant seeping from the front of the rear differential, a wet, grimy area around the pinion, or a low fluid level. Confirm the leak source before replacing the seal.
What part numbers does the SS6405 interchange with?
Schaeffler SS6405 cross-references to 20042A and 4136405100.
