National
Manual Transmission Input Shaft Seal
$29.45
National
Part # 4638N
4.7(47 reviews)Jont entré Man Trans
Fits Chevrolet, GMC, Dodge — 144 vehicle applications
$8.27
Only 5 left in stock
1
Express Checkout
Free ShippingOrders $99+
WarrantyManufacturer backed
Easy Returns30-day policy
Canadian OwnedShipped across Canada
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National 4638N Vehicle Fitment
Fits 144 vehiclesThis Jont entré Man Trans fits Chevrolet, GMC, Dodge vehicles.
2007 GMC Sierra 2500 HD Classic
2007 GMC Sierra 3500 Classic
2002-2006 GMC Sierra 1500
2001-2006 GMC Sierra 2500 HD
2001-2006 GMC Sierra 3500
1999-2004 GMC Sierra 2500
1996-2002 GMC C3500HD
1996-2000 GMC C2500
1996-2000 GMC C3500
1996-2000 GMC K2500
1996-2000 GMC K3500
1996-1999 GMC P3500
1996-1998 GMC C1500
1996-1998 GMC K1500
National 4638N Specifications
- Grade Type
- Standard Replacement
- Series
- 4000
- Outside Diameter
- 50.520
- Housing Bore
- 1.982
- Outside Diameter
- 1.989
- Housing Bore
- 50.340
National 4638N Product Description
National 4638N Boîte de vitesses manuelle – Arbre d’entrée – Joint pour Chevrolet Silverado 2500
Key Features
- Delivers quality and reliable performance for every type of repair
- Design type: spring loaded; multi-lip
- Low swell in hydrocarbon fluids
- Resistance to EP lubricants
- Temperature range: -20°F to 300°F / -29°C to 49°C
- Baja expansión en fluidos de hidrocarburos
- Ofrece un rendimiento confiable de calidad para cada tipo de reparación
- Rango de temperatura: -20°F a 300°F / -29°C a 49°C
- Resistente a lubricantes EP
- Tipo de diseño: Carga de resorte; multi-labio
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 Manual Transmission Input Shaft Seal at Autrex with vehicle fitment details, current pricing, and checkout options for the National 4638N. 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 4638N
What vehicles does the National 4638N fit?
The National 4638N fits 29 vehicle applications including 2007 Chevrolet Silverado 2500 HD Classic, 2007 Chevrolet Silverado 3500 Classic, 2007 GMC Sierra 2500 HD Classic, 2007 GMC Sierra 3500 Classic, 2002-2006 Chevrolet Silverado 1500 and 24 more. Check the full fitment list above to confirm your vehicle.
What are the shipping options for the National 4638N?
Shipping options for the National 4638N 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 4638N cost?
The National 4638N is currently listed at $8.27 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 Jont entré Man Trans a direct fit replacement?
Yes, the Jont entré Man Trans by National is designed as a direct fit replacement. Use our vehicle selector to confirm compatibility with your specific vehicle.
What warranty does the Jont entré Man Trans come with?
The Jont entré Man Trans comes with the standard National manufacturer warranty. Please check the product specifications for exact warranty terms.
