Whats the id and od for this?

Thank you for your inquiry. The National Pinion Seal 4278 fits a shaft diameter of 1.812" and the seal OD is 3.096"

Does this fit a 1968 ford 8 inch? Thanks

Thank you for the question. Sorry, the National 4278 is not cataloged for this year model vehicle. Additional vehicle information is needed. Please follow catalog listings including fitment notes to determine correct application.

National 4278 Differential Pinion Seal For 1999 2022 Ford F

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Description

🚀 Seal the deal with National – where durability meets precision!

FLUID COMPATIBILITY - Works seamlessly with a wide range of automotive fluids for versatile repairs.
TRUSTED LEGACY BRAND - National’s 75+ years of sealing innovation ensures reliability you can count on.
UNMATCHED HEAT ENDURANCE - Operates flawlessly from -40°F to 400°F, built for extreme conditions.
PRECISION FIT FOR FORD F 150 - Engineered specifically for 1999-2022 Ford F-150 models and compatible vehicles.
ADVANCED MULTI LIP SEAL DESIGN - Spring-loaded for superior sealing and leak prevention under pressure.

The National 4278 Differential Pinion Seal is a premium, spring-loaded multi-lip seal designed for 1999-2022 Ford F-150s and compatible models. Engineered to withstand extreme temperatures from -40°F to 400°F, it offers exceptional fluid compatibility and reliable performance, backed by National’s 75+ years of industry expertise.

Specifications

ASIN	B000C5J0U4
Best Sellers Rank	#83,830 in Automotive ( See Top 100 in Automotive ) #5 in Automotive Replacement Differential Seals
Brand	National
Brand Name	National
Container Type	Bottle
Customer Reviews	4.4 out of 5 stars 212 Reviews
Global Trade Identification Number	00724956125289
Included Components	Multi Purpose Seal
Item Form	Grease
Item Highlight	Compatible with Land Rover Defender 90 1994-1997
Item Weight	9.07 g
Liquid Volume	946 ml
Manufacturer	National
Material	Fluoroelastomer
Model Number	4278
Number of Items	1
Package Information	Bottle
Part Number	4278
Recommended Uses For Product	Automotive
Specific Uses For Product	Automotive differentials
UPC	724956125289
Unit Count	1 Count
Upper Temperature Rating	400 °F

Reviews

O**Y

Old Guy

Perfect fit for my ford pick up pinion seal.

14.09.2025

D**E

Make sure you have the right part number.

Did not fit. But my fault, I didn't know that there were early and late models.

12.05.2026

J**.

fit fine

havent rechecked for leeks

7.07.2023

C**N

Solid product for an affordable price

Holding up nicely

3.10.2026

J**Z

Muy bueno

Queda perfecto

3.05.2026

B**D

worked as it should

worked as it should. no leaks for 25k+ miles

4.03.2026

P**O

Didn’t fit

Didn’t fit my ford f150 2001

17.06.2026

A**O

Bien.

4.03.2026

J**E

Great product

Seems like better quality than the OEM seal and worked perfect for my 2021 F150.

23.04.2026

C**A

Fits a Sterling 10.25" differential

Fit on a 1994.5 f350 with sterling 10.25" rear.

1.04.2026

T**S

So far

As described looks solid and good will update on friday if it truly fits

26.03.2026

T**5

Great fit

Worked out great axle seal Ford 9"

14.08.2026

S**S

Good product

Met our needs, great price

19.06.2023

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National 4278 Differential Pinion Seal for 1999 - 2022 Ford F-150

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Description

Specifications

Reviews

Common Questions