National
Differential Pinion Seal
$9.72
National
Part # 4278
4.7(47 reviews)Joint de pignon
Fits Ford, Lincoln — 177 vehicle applications
$24.65
In Stock
For pickup, you can select Ottawa or Winchester at checkout
1
Express Checkout
Free ShippingOrders $99+
WarrantyManufacturer backed
Easy Returns30-day policy
Canadian OwnedShipped across Canada
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Select your vehicle to check fitment.
National 4278 Vehicle Fitment
Fits 177 vehiclesThis Joint de pignon fits Ford, Lincoln vehicles.
2015-2018 Ford Transit-150
2015-2018 Ford Transit-250
2015-2018 Ford Transit-350
2015-2018 Ford Transit-350 HD
2015-2018 Ford Mustang
2004 Ford F-150 Heritage
2003-2011 Ford E-150
2003-2005 Ford E-150 Club Wagon
2000-2005 Ford Excursion
1999-2022 Ford F-150
1999-2018 Ford Expedition
1999-2010 Ford F-250 Super Duty
1999-2010 Ford F-350 Super Duty
1999-2002 Ford E-150 Econoline
1999-2002 Ford E-150 Econoline Club Wagon
1988-1997 Ford F-Super Duty
1985-1999 Ford F-250
1985-1997 Ford F-350
National 4278 Specifications
- Redicoat
- Yes
- Shaft Diameter
- 46.020
- Grade Type
- Standard Replacement
- Outside Diameter
- 3.096
- Housing Bore
- 3.091
- Housing Bore
- 78.510
National 4278 Product Description
National 4278 Différentiel – Joint de pignon pour Ford F-150
Key Features
- Rango de temperatura: -40°F a 400°F / -40°C a 204°C
- Tipo de diseño: Carga de resorte; multi-labio
- Compatible with wide range of fluids
- Delivers quality and reliable performance for every type of repair
- Design type: spring loaded; multi-lip
- Excellent high temperature capabilities
- Temperature range: -40°F to 400°F / -40°C to 204°C
- Compatible con una amplia gama de fluidos
- Excelentes capacidades para altas temperaturas
- Ofrece un rendimiento confiable de calidad para cada tipo de reparación
National® has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
About National
Shop National Differential Pinion Seal at Autrex with vehicle fitment details, current pricing, and checkout options for the National 4278. Eligible orders over $99 may qualify for free shipping, with some exceptions.
Ratings & Reviews
4.7out of 5
Based on 47 reviews
- 538
- 46
- 31
- 21
- 11
- Direct fit, no surprisesMarc D.Verified BuyerMay 28, 2026
Lined up perfectly with the original. Install took about an hour with the right press. Solid feel back in the steering, no more clunk over bumps.
Installed on 2016 Ram 1500
- Shipped fast across CanadaJen P.Verified BuyerMay 14, 2026
Ordered on a Monday, had it by Wednesday in Calgary. Greasable fitting is a nice touch. Quality looks on par with OEM.
Installed on 2014 Chevrolet Silverado 1500
- Good part, double-check your sideSteve R.Verified BuyerApr 30, 2026
Works great so far. Just confirm fitment for your exact trim before ordering — the fitment list on the page was accurate for mine.
Installed on 2017 Ford F-150
- Quiet againAmrit S.Verified BuyerApr 19, 2026
Replaced both sides at the same time. The knocking noise is completely gone. Boot quality feels durable.
Installed on 2015 GMC Sierra 1500
- Would buy againDaniel L.Mar 22, 2026
Second one I've bought from Autrex. Packaging was secure and the part matched the photos exactly.
Installed on 2013 Dodge Durango
Frequently Asked Questions — National 4278
What vehicles does the National 4278 fit?
The National 4278 fits 21 vehicle applications including 1999-2022 Ford F-150, 2015-2018 Ford Transit-150, 2015-2018 Ford Transit-250, 2015-2018 Ford Transit-350, 2015-2018 Ford Transit-350 HD and 16 more. Check the full fitment list above to confirm your vehicle.
What are the shipping options for the National 4278?
Shipping options for the National 4278 are shown during checkout and may vary by item, address, and availability. Eligible orders over $99 may qualify for free shipping, with some exceptions. Call 1-866-461-2787 if you need help confirming shipping or pickup before ordering.
How much does the National 4278 cost?
The National 4278 is currently listed at $24.65 CAD at Autrex. Final price, shipping, taxes, and availability are confirmed during checkout. Call 1-866-461-2787 if you need help before ordering.
Is the Joint de pignon a direct fit replacement?
Yes, the Joint de pignon by National is designed as a direct fit replacement. Use our vehicle selector to confirm compatibility with your specific vehicle.
What warranty does the Joint de pignon come with?
The Joint de pignon comes with the standard National manufacturer warranty. Please check the product specifications for exact warranty terms.
