Timken 3404 Automatic Transmission Torque Converter Seal

Timken 3404 Torque Converter Seal

The Timken 3404 automatic transmission torque converter seal is built for Ford and Mercury applications that need a precise seal at the transmission interface. It uses a reinforced outer case, a ribbed rubber inner diameter, and an internal contamination exclusion design to help maintain sealing performance in demanding driveline service.

Compatible with a wide range of Ford F-150, E-Series, Crown Victoria, Expedition, and related rear-wheel-drive applications, this seal is sized for accurate housing and shaft fitment. The Timken 3404 is a practical replacement choice when servicing the transmission seal area on vehicles with 4R70W, AODE, E4OD, and related configurations.

Key Features

• Automatic transmission torque converter seal for Ford and Mercury applications
• H-silicone material for sealing performance in transmission service
• Reinforced outer case helps resist installation damage
• Ribbed rubber inner diameter helps seal minor spindle imperfections
• Internal contamination exclusion system helps block debris entry
• Vent holes promote lubricant flow around the seal lip to reduce heat build-up
• Dimensions: 2.751 in. outside diameter, 1.996 in. shaft diameter, 2.743 in. housing bore, 0.325 in. width
• Clockwise helix type

Detailed Description

Timken 3404 is engineered as an automatic transmission torque converter seal for service on Ford and Mercury drivetrains where reliable fluid control is critical. The seal’s reinforced outer case supports installation durability, while the ribbed inner diameter helps maintain contact on shafts with minor surface variation. Vent holes are incorporated to keep lubricant moving around the seal lip, which helps manage heat at the sealing surface. This part cross-references Gates 19799 and 19839 for the same application.

Fits 2011-2016 Ford E-350 Super Duty, Outer; Fits 2006-2014 Ford E-150; Fits 2005-2014 Ford E-250; Fits 2000-2011 Ford Crown Victoria; Fits 2004-2010 Ford F-150; Fits 1990-1999 Ford F-150; Fits 2007-2010 Mercury Grand Marquis; Fits 2003-2005 Ford E-150, 4R70W; Fits 2003-2005 Ford E-150 Club Wagon, 4R70W; Fits 2000-2005 Ford Expedition, 4R70W; Fits 2005 Ford F-150, 4R70W; Fits 2000-2003 Ford F-150, 4R70W; Fits 2000-2004 Ford Crown Victoria, 4R70W; Fits 2003-2004 Ford E-250, 4R70W; Fits 2004 Ford F-150 Heritage, 4R70W; Fits 2000-2003 Ford E-350 Super Duty, 4R70W; Fits 2000-2003 Ford Excursion; Fits 2000-2002 Ford E-150 Econoline, 4R70W; Fits 2000-2002 Ford E-150 Econoline Club Wagon, 4R70W; Fits 2000-2002 Ford E-250 Econoline, 4R70W; Fits 2000-2002 Ford E-350 Econoline Club Wagon, 4R70W; Fits 2000-2001 Ford Explorer, 4R70W; Fits 1997-2001 Mercury Mountaineer, 4R70W; Fits 1990-1999 Ford E-150 Econoline; Fits 1990-1999 Ford E-150 Econoline Club Wagon; Fits 1989-1999 Ford E-250 Econoline; Fits 1997-1999 Ford Expedition; Fits 1989-1999 Ford F-250; Fits 1994-1999 Ford Mustang, AODE; Fits 1990-1998 Ford E-350 Econoline; Fits 1990-1998 Ford E-350 Econoline Club Wagon; Fits 1998 Lincoln Navigator, E4OD; Fits 1997 Ford F-250 HD; Fits 1989-1997 Ford F-350; Fits 1990-1996 Ford Bronco; Fits 1994-1995 Mercury Cougar, AODE; Fits 1989-1991 Ford E-250 Econoline Club Wagon.

What It Helps Solve

• Transmission fluid leakage at the torque converter seal area
• Contamination entering the seal interface during service
• Seal wear caused by heat build-up around the lip
• Poor sealing on shafts with minor surface imperfections
• Repeat service issues on Ford F-150, E-Series, and Crown Victoria applications

Installation Notes and Tips

Verify shaft diameter, housing bore, width, and helix direction before installation. Clean the sealing surface thoroughly and inspect the converter and transmission bore for wear, scoring, or debris that could affect seal seating. Confirm the application-specific transmission code, such as 4R70W, AODE, or E4OD, when matching the seal to the vehicle.

Quality Assurance

Timken manufactures oil and grease seals with precision sealing designs focused on fluid retention and contaminant exclusion. The 3404 follows that approach with a reinforced case and debris-control features intended for transmission service.