National
Manual Transmission Input Shaft Seal
$29.45
National
Part # 3638
4.7(47 reviews)Jont entré Man Trans
Fits Shelby, Jeep, Ford & more — 954 vehicle applications
$20.14
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 3638 Vehicle Fitment
Fits 954 vehiclesThis Jont entré Man Trans fits Shelby, Jeep, Ford, Chevrolet and 2 more makes vehicles.
1979-1982 GMC G2500
1979-1982 GMC G3500
1979-1981 GMC C1500
1979-1981 GMC C1500 Suburban
1979-1981 GMC C2500
1979-1981 GMC C2500 Suburban
1979-1981 GMC C3500
1979-1981 GMC K1500
1979-1981 GMC K1500 Suburban
1979-1981 GMC K2500
1979-1981 GMC K2500 Suburban
1979-1981 GMC P2500
1979-1981 GMC P3500
1976-1981 GMC Jimmy
1976-1978 GMC C15
1976-1978 GMC C15 Suburban
National 3638 Specifications
- Type
- 48
- Housing Bore
- 1.624
- Inside Diameter
- 1.125
- Helix Type
- Clockwise-Spiral Lip Design
- Series
- 3000
- Outside Diameter
- 41.350
National 3638 Product Description
National 3638 Manual Transmission Input Shaft Seal for Ford F-150
Key Features
- Design type: spring loaded; single-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; un solo labio
- Delivers quality and reliable performance for every type of repair
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 3638. 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 3638
What vehicles does the National 3638 fit?
The National 3638 fits 50 vehicle applications including 1999-2000 Shelby Series 1, 1984-1990 Jeep Grand Wagoneer, 1980-1988 Jeep J10, 1980-1988 Jeep J20, 1976-1986 Jeep CJ7 and 45 more. Check the full fitment list above to confirm your vehicle.
What are the shipping options for the National 3638?
Shipping options for the National 3638 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 3638 cost?
The National 3638 is currently listed at $20.14 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.
