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.

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National 4278 Differential Pinion Seal

Product ID: 398959733

Details

Brand
NATIONAL
Item weight
9 g
Liquid volume
946
Material
Package information
Bottle

💧Compatible with a wide range of automotive fluids

🔥Withstands up to 400°F high heat

🛠️Spring-loaded multi-lip design for superior sealing

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S$48

Duties & taxes included

In stock

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Description

🛡️ Seal the deal with National – where performance meets precision!

TRUSTED LEGACY FIT - National’s 75+ years of expertise guarantees a perfect fit and reliable repair
FLUOROELASTOMER DURABILITY - Premium material resists wear, chemicals, and heat for long-lasting performance
PRECISION SPRING LOADED SEAL - Multi-lip design ensures a perfect, leak-proof fit every time
UNMATCHED THERMAL RESILIENCE - Operates flawlessly from -40°F to 400°F, built for extreme conditions
VERSATILE FLUID COMPATIBILITY - Engineered to handle diverse automotive fluids without degradation

The National 4278 Differential Pinion Seal is a premium, spring-loaded multi-lip seal made from durable fluoroelastomer. Engineered to withstand extreme temperatures from -40°F to 400°F and compatible with a wide range of automotive fluids, it delivers reliable, long-lasting performance for differential repairs. Backed by over 75 years of industry expertise, this seal ensures a perfect fit and superior protection for your vehicle’s drivetrain.

Specifications

ASIN	B000C5J0U4
Brand Name	NATIONAL
Container Type	Bottle
Country of Origin	Mexico
Customer Reviews	4.4 4.4 out of 5 stars (182)
Global Trade Identification Number	00724956125289
Included Components	Multi Purpose Seal
Item Form	Grease
Item Weight	0.02 Pounds
Liquid Volume	946 Milliliters
Manufacturer	Federal Mogul
Material	Fluoroelastomer
Recommended Uses For Product	Automotive
Specific Uses For Product	Automotive differentials
UPC	724956125289
Unit Count	1 Count
Upper Temperature Rating	400 Degrees Fahrenheit

Reviews

O**Y

Perfect fit for my ford pick up pinion seal.

14.09.2025

S**S

Met our needs, great price

19.06.2023

B**D

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

4.03.2026

9**T

Probably a good seal, I’ll never know since it doesn’t fit my axle

28.03.2021

A**O

Bien.

4.03.2026

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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