Ford 10.25" & 10.5" 12-Bolt Fiber Differential Cover Gasket

• Fiber gasket seals the differential cover, prevents gear oil leaks

• One gasket fits both Ford Sterling 10.25" and 10.5" axles (shared bolt pattern)

• Fits F-250/F-350/Super Duty, Excursion, E-350/E-450 Super Duty

• Not for Ford 8.8", 9.75", or Dana 60/70/80/M275 axles

This fiber differential cover gasket is sized and punched for Ford Sterling 10.25" and 10.5" rear axle housings — two heavy-duty Ford rear ends that share the same 12-bolt cover pattern, allowing one gasket to serve both axle sizes. This makes it a common service gasket across a wide range of Ford heavy-duty truck and SUV applications, including F-150, F-250, F-350 Super Duty, Bronco, and Excursion builds.

It's a direct replacement for a leaking, damaged, or missing cover gasket, providing a reliable fiber seal between the differential cover and axle housing sealing rail during cover reinstallation, fluid changes, or cover upgrades. A worn, crushed, or damaged cover gasket is one of the most common causes of gear oil seepage at the rear axle — this gasket is usable with or without RTV compound depending on your preference and the cover's sealing surface condition.

Some F-250 and F-350 trucks were equipped with Dana rear axles instead — verify your axle identification before ordering, since this gasket does not fit Ford 8.8", Ford 9.75", Dana 60, Dana 70, Dana 80, or Dana M275 axles. This gasket is sold individually and includes no hardware, cover, or drain plug.

Applications
Fits Ford Sterling 10.25" and 10.5" rear axle housings using the factory 12-bolt differential cover pattern, factory or aftermarket. Common applications include Ford F-250 (1985-1997), F-350 (1985-1997), F-250 Super Duty (1999-2024, Sterling 10.5" axle), F-350 Super Duty (1999-2024), Excursion (2000-2005), and select E-350/E-450 Super Duty models.

Installation
Sold individually — no hardware, cover, or drain plug included. Verify axle identification before ordering, as many Ford trucks were available with multiple rear axle options. Clean the cover and housing sealing surfaces thoroughly before installation. Confirm cover shape, sealing surface, and fill/drain configuration.

Does this gasket fit both the 10.25" and 10.5" axle?
Yes — the Ford Sterling 10.25" and 10.5" axles share the same 12-bolt cover pattern, so one gasket fits both.

My F-250/F-350 might have a Dana axle instead — how do I know?
Some F-250 and F-350 trucks were equipped with Dana rear axles instead of the Sterling 10.25"/10.5". Verify your axle identification before ordering, since this gasket does not fit Dana 60, 70, 80, or M275 axles.

Will this fit a Ford 8.8" or 9.75" axle?
No — this gasket is specific to the Ford Sterling 10.25"/10.5" and is not compatible with Ford 8.8" or 9.75" axles.

How many bolts does this cover pattern use?
12 bolts.

Does this come with the cover or hardware?
No — this gasket is sold individually. Cover, hardware, and drain plug are not included.

What vehicles use this axle?
Ford F-250, F-350, F-250/F-350 Super Duty, Excursion, and select E-350/E-450 Super Duty models.