National Drive Axle Shaft Seal for 2009–2018 Ford F-150 — Spring-loaded Multi-lip, Temp-resistant

National 710950 is a spring-loaded, multi-lip drive axle shaft seal engineered to replace worn axle seals on compatible Ford and Lincoln trucks, including 2009–2018 F-150 models.

This axle seal from National pairs decades of sealing expertise with modern materials to help retain gear oils and keep contaminants out of the axle housing. The part uses a spring-loaded, multi-lip configuration and a temperature-resistant elastomer to tolerate the wide-ranging conditions encountered in everyday driving, towing, and off-road use. It’s designed as a direct-replacement service item where the original-style sealing geometry is required.

What vehicles does this National 710950 seal fit?

This seal is intended for a broad set of Ford and Lincoln applications; always confirm fitment with vehicle year, model, axle type, and trim. The part covers many model years of F-150 and related vehicles used across North America.

• Confirmed coverage includes many 2009–2018 Ford F-150 model years.
• Also used on select 2006–2018 Ford Explorer, Expedition, and Lincoln Navigator platforms.
• Verify exact axle and trim using fitment tools or by comparing OEM part numbers.

How does the spring-loaded, multi-lip design benefit axle sealing?

The spring-loaded lip maintains consistent radial pressure against the axle shaft, which helps limit leakage as parts wear. Multiple sealing lips provide staged defense—an inner lip for fluid retention and outer lips to shed dirt and moisture, improving long-term reliability in varied conditions.

• Spring energizer keeps sealing force consistent over time.
• Multi-lip profile reduces chance of contaminants entering the axle.
• Material compatibility with common gear oils and lubricants.

What temperature and fluid conditions can this seal handle?

National specifies a wide temperature range so the seal performs from cold starts through high-heat operating conditions. The elastomeric compound is formulated to resist swelling or degradation from typical axle fluids and lubricants.

• Rated for approximately -40°F to 400°F (-40°C to 204°C).
• Designed to be compatible with a broad range of gear oils and automatic transaxle fluids.
• Good high-temperature endurance for towing or heavy-load use.

How do I be sure this part is the right replacement for my repair?

Before installing, match the part to your vehicle’s axle type and OEM reference numbers. Use the vehicle fitment tool on the retailer site and consult your service manual or a parts professional when in doubt to avoid ordering errors.

• Check year, make, model, engine, axle code, and trim before purchase.
• Compare the National part number 710950 to the old seal or OEM number.
• Inspect shaft surface and seal bore for wear before installation.

Who is this for: This National 710950 drive axle shaft seal is aimed at DIY mechanics, professional technicians, and fleet maintenance teams replacing worn axle seals on compatible Ford and Lincoln models. It’s appropriate for routine maintenance, axle rebuilds, or leak repairs where an OEM-style spring-loaded, multi-lip seal is specified. If your project requires lasting fluid retention and broad fluid compatibility in harsh temperature ranges, this part is built to meet those service needs when matched to the correct axle application.