SKF 13770A Automatic Transmission Output Shaft Seal - Left

SKF 13770A Output Shaft Seal for Subaru

SKF 13770A is an automatic transmission output shaft seal built for Subaru applications that need reliable fluid retention at the transmission shaft. With a polyacrylate sealing surface and precise dimensions, this seal is made to match the shaft and housing interface for consistent sealing performance.

Fits 2003-2017 Subaru Forester, Left; Fits 2005-2017 Subaru Impreza, Left; Fits 2005-2017 Subaru Legacy, Left; Fits 2005-2017 Subaru Outback, Left; Fits 2015-2017 Subaru WRX, Left.

Key Features

• Automatic transmission output shaft seal for Subaru driveline service
• Part number 13770A for direct identification and ordering
• Polyacrylate sealing surface type for transmission sealing applications
• Outside diameter: 1.977 in.
• Shaft diameter: 1.378 in.
• Width: 0.354 in.
• Fits left-side applications across multiple Subaru models

Detailed Description

SKF 13770A is engineered as an output shaft seal for the automatic transmission, helping maintain the fluid barrier where the shaft exits the transmission case. SKF has a long history in seal design and manufacturing, and this part reflects that focus with application-specific dimensions and premium sealing materials. It is a strong match for Subaru Forester, Impreza, Legacy, Outback, and WRX fitments where the left-side transmission output shaft seal is required. This part cross-references Monroe Shocks & Struts (e.g., 806735290) for the same application.

What It Helps Address

• Transmission fluid leakage at the output shaft area
• Contamination entering the transmission through a worn seal
• Fluid loss that can lead to shifting concerns
• Seal wear from age, heat, and normal drivetrain use
• Service replacement for Subaru left-side output shaft seal applications

Installation Notes and Tips

Confirm shaft diameter, outside diameter, and width before installation to verify the seal matches the transmission housing. Inspect the shaft surface for scoring or wear, and clean the sealing area thoroughly before fitting the new seal. Use proper seal installation tools to avoid damaging the sealing lip or distorting the case bore. Verify the vehicle application by year, model, and left-side position before assembly.

Quality Assurance

SKF manufactures seals to specific designs using premium materials and controlled production standards. The brand’s seal engineering background and long-term focus on durability support dependable service life in transmission applications.