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National Oil Seal 4278 Differential Pinion Seal

(Ford F-150 1999-2015, 2017, F-250 Super Duty 1999-2016, F-350 Super Duty 1999-2016, Expedition 1999-2016, F-250 1985-99, Excursion 2000-05 + 14 more models)

Manufacturer

Picture for manufacturer National Oil Seal

Part Number

4278
7 reviews
Sale Price

$12.54

In Stock (10+)

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Usually delivered within 2 days

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Product Details

The National Oil Seal 4278 is a precision-engineered differential pinion seal designed to provide reliable sealing performance for Ford and Lincoln vehicles. This seal prevents differential oil leaks and maintains proper lubrication in demanding driveline applications.

Key Specifications:

  • Inside Diameter (Shaft): 1.812 inches
  • Outside Diameter: 3.096 inches
  • Housing Bore: 3.091 inches
  • Seal Width: 0.485 inches
  • Flanged OD: 3.400 inches

Features:

  • Constructed from durable fluoro-elastomer material for superior heat and oil resistance
  • Redicoat finish for enhanced performance
  • Precision dimensions ensure proper fit and effective sealing around the pinion shaft
  • Robust barrier against oil leaks and contamination ingress
  • Designed to withstand high temperature and pressure conditions

This differential pinion seal helps maintain differential integrity, prevents costly repairs due to seal failure, and ensures consistent performance in harsh operating environments. Cross-references to numerous OEM part numbers including Ford numbers 1L3Z-4676-A, 1L3Z-4676-B, E5TZ4676A, and E8TZ-4676B.

Products specifications

Fits

Ford F-150 1999-2015, 2017, F-250 Super Duty 1999-2016, F-350 Super Duty 1999-2016, Expedition 1999-2016, F-250 1985-99, Excursion 2000-05, F-350 1985-98, E-150 1999-2011, Transit-250 2015-16, E-150 Econoline 1999-2002 + 10 more models

Agricultural Equipment

N

Application Specific

Y

Car Light Truck

N

Engine Specific

N

Freight Class

60

Heavy Duty Truck

N

High Performance

Y

Industrial Off Highway Equipment

N

Marine

N

Medium Duty Truck

N

Motorcycle ATV

N

Non Vehicle Specific

N

Personal WaterCraft

N

Small Engine

N

SnowMobile

N

Transmission Specific

N

Width (inch)

0.485

Feature 2

Design Type: Spring Loaded; Multi-Lip

Feature 4

Provides long life while provideing superior performance

Feature 5

Temperature Range: -40F to 400F; -40C to 204C

Footnote

Flanged O.D.

Material

Fluoro-Elastomer

Outside Diameter (Inch)

3.095

Outside Diameter (mm)

78.640

Part Description

Oil Seal

Part Type

Seals

Series

4000

Type

86

Flanged Outside Diameter (Inch)

3.400

Flanged Outside Diameter (MM)

86.360

Housing Bore (MM)

78.510

Outer Diameter (Inch)

3.095

Redicoat

Yes

Shaft (MM)

46.020

Shaft Size (Inch)

1.809

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