National 711106 Automatic Transmission Extension Housing Seal

Automatic Transmission Extension Housing Seal

National 711106 is an automatic transmission extension housing seal built for metric applications that require a precise sealing fit. It uses a fluoro-elastomer construction and a bi-directional lip design to help maintain a consistent seal at the transmission extension housing.

Compatible with select Ford and Lincoln vehicles, including Ford F-150, Transit-150, Transit-250, Transit-350, Transit-350 HD, Expedition, Mustang, and Lincoln Navigator applications. This part number, 711106, is also referenced in interchange listings for B37323, FL3P-7052-AA, and FL3Z-7052-A.

Key Features

• Automatic transmission extension housing seal / oil seal
• Fluoro-elastomer material for sealing performance
• Bi-directional lip design
• Metric dimensions for accurate housing and shaft fit
• Outside diameter: 3.165 in. / 80.400 mm
• Housing bore: 3.157 in. / 80.200 mm
• Shaft size: 2.205 in. / 56.000 mm
• Overall width with side lip: 0.591 in. / 15.000 mm

Detailed Description

National 711106 is part of the 711100 series and is engineered as an automatic transmission extension housing seal for metric-fit applications. The seal measures 3.346 in. flanged outside diameter, 3.165 in. outside diameter, and 0.354 in. width, with a 0.591 in. overall width including the side lip. Its fluoro-elastomer construction is selected for sealing durability, while the bi-directional lip design supports consistent contact at the shaft interface.

Use this seal when servicing Ford 6R80 transmission applications on 2015 Ford Expedition, F-150, Mustang, Transit-150, Transit-250, Transit-350, Transit-350 HD, and Lincoln Navigator, as well as 2016-2019 Ford F-150, Transit-150, Transit-250, Transit-350, Transit-350 HD, 2016-2017 Ford Expedition, Mustang, and Lincoln Navigator. National 711106 is a direct-fit style transmission seal for these listed applications.

What It Helps Address

• Transmission fluid leakage at the extension housing
• Seal wear from age, heat, and fluid exposure
• Loss of sealing integrity at the shaft opening
• Service replacement for damaged or hardened oil seals
• Fitment issues when replacing the extension housing seal on listed Ford and Lincoln models

Installation Notes and Tips

Confirm housing bore, shaft diameter, and seal width before installation. Clean the extension housing and shaft sealing surface thoroughly, and inspect for scoring or wear that could affect sealing performance. For best results, install the seal squarely to avoid lip damage during assembly.

Verify vehicle application by year, make, model, and transmission configuration before ordering. This part number, 711106, is commonly searched for Ford F-150 and Transit transmission seal service, along with Lincoln Navigator and Mustang 6R80 applications.

Quality Assurance

National has more than 75 years of experience in sealing solutions and continues to develop products for modern vehicle service needs. The 711106 extension housing seal reflects that focus on dimensional accuracy and material selection for transmission sealing applications.