For the DIY mechanics and professional technicians out there, this National output shaft seal is one of those crucial components that can save you from major transmission headaches down the road. This isn't your basic single-lip seal - it's a multi-lip, spring-loaded design that provides superior sealing performance for automatic transmission output shafts. The temperature range is impressive too, handling everything from -20°F to 300°F, which covers the extreme conditions your transmission experiences from cold starts to heavy load operation. The material is specifically formulated to resist swelling in hydrocarbon fluids and provide protection from EP (extreme pressure) lubricants, meaning it won't degrade over time like cheaper seals might. When your output shaft seal starts leaking, you'll typically see transmission fluid dripping from where the driveshaft meets the transmission - not something you want to ignore, as low fluid can lead to serious transmission damage. Replacement requires draining some transmission fluid, removing the driveshaft, prying out the old seal, and carefully installing this new one. The quality of National seals is what mechanics trust - they deliver reliable performance that matches or exceeds OEM specifications. Whether you're fixing a leak on your daily driver or working on a customer's vehicle, using a quality seal like this means you won't be doing the same job again in six months. Proper installation is key - make sure the sealing surface is clean and smooth, and use the right tools to avoid damaging the new seal during installation.
Free 30-day returns 
Free 30-day returns
