Description
Product Overview
The National Automatic Transmission Output Shaft Seal (model 711111) is engineered for durability and precision. Featuring a spring loaded, multi‑lip design, the seal maintains optimal pressure across a broad temperature range of -20°F to 300°F (-29°C to 49°C). Constructed from machined exterior material, it offers low swell when exposed to hydrocarbon fluids and robust protection against EP (extreme pressure) lubricants. Weighing just 1.23 ounces and packaged in a compact 3.46 x 3.27 x 0.87‑inch box, this seal fits seamlessly into standard automatic transmission assemblies.
Usage
Designed for both professional mechanics and experienced DIY enthusiasts, this seal is ideal for replacing worn or damaged output shaft seals in automatic transaxles. It performs reliably in everyday driving conditions as well as high‑performance applications, handling the thermal stresses of stop‑and‑go traffic and extended highway cruising. Suitable for a variety of vehicle makes, the seal ensures a leak‑free operation, protecting the transmission from fluid loss and contamination.
Why Choose Us
National brings decades of automotive expertise to every component. This output shaft seal undergoes rigorous quality testing to meet OEM specifications, guaranteeing a perfect fit and long‑term reliability. The spring loaded mechanism compensates for shaft wear, maintaining seal integrity without the need for frequent adjustments. With a proven track record reflected in a 5‑star customer rating, you can trust this seal to deliver consistent performance in every repair.
Key Features
- Spring loaded, multi‑lip design for consistent sealing pressure
- Operates reliably from -20°F to 300°F (-29°C to 49°C)
- Resistant to EP lubricants and low swell in hydrocarbon fluids
- Machined exterior for precise fit and durability
- Compact size and lightweight for easy installation
FAQ
What vehicles are compatible with the 711111 seal?
The 711111 seal is a standard size used in many automatic transmissions across various brands. Consult your vehicle’s service manual or the OEM part number to confirm compatibility.
Can I install this seal myself?
Yes, with basic hand tools and a proper seal installer kit, a DIY enthusiast can replace the seal. Ensure the transmission is clean and the shaft is free of debris before installation.
How does the spring loaded design improve performance?
The spring maintains constant pressure on the seal lips, compensating for shaft wear and thermal expansion, which reduces the risk of leaks and extends service life.
Is this seal suitable for high‑performance applications?
Absolutely. Its temperature rating up to 300°F and resistance to EP additives make it suitable for performance tuning and heavy‑duty use.
What warranty does National provide?
National offers a limited warranty covering manufacturing defects. Refer to the packaging or the official website for specific warranty terms.
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