Keep your rear differential sealed and stop gear oil from weeping past the pinion with the Timken Differential Pinion Seal 9773R. It installs as a direct-fit replacement for a wide range of medium- and heavy-duty trucks, including the 1980-1988 Ford F-600, F-700 and F-800, the 1969-1970 International 1000D, the 1974 International 100, and the 1986-1993 Mack CS300P Mid-Liner — 41 applications in all, so check the Buyer's Guide tab for the complete list.
Seals the pinion shaft: rides around the differential pinion where the driveshaft yoke meets the axle housing, holding the gear lubricant inside.
Rear differential seal: cataloged in the rear position for the listed trucks.
Signs it may need replacing: gear oil weeping at the pinion nose or yoke, drips tracking down the driveshaft, or a falling differential fluid level.
A worn pinion seal lets the differential's gear oil escape around the rotating pinion. The seal body stays stationary in the housing while its lip contacts the rotating pinion shaft. If a leaking pinion seal is the cause of your axle leak, this replaces it. Diagnose the source of any leak before replacing, and check the differential fluid level afterward. Manufacturer part number 9773R.
Frequently Asked Questions
What does the Timken 9773R do?
It's a differential pinion seal that rides around the pinion shaft where the driveshaft yoke meets the axle housing, keeping the differential's gear oil sealed inside.
Is this a front or rear seal?
It's cataloged in the rear position — the rear differential pinion seal for the listed applications.
Which vehicles does it fit?
It covers 41 applications across Ford, International and Mack medium- and heavy-duty trucks, such as the 1980-1988 Ford F-600 and the 1986-1993 Mack CS300P Mid-Liner. See the Buyer's Guide tab for the full list.
How do I know the pinion seal is failing?
Common signs are gear oil weeping at the pinion nose or yoke, oil drips down the driveshaft, or a dropping differential fluid level. Diagnose the leak source before replacing.
Do I need to add fluid after replacing it?
Check the differential fluid level after installation and top off with the lubricant specified in your vehicle's service information, since some fluid is usually lost during the repair.
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WARNING:
These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to
www.P65Warnings.ca.gov.
