National 331228H Automatic Transmission Torque Converter Seal - Front

Automatic Transmission Torque Converter Seal

National 331228H is an automatic transmission torque converter seal built for Chrysler, Dodge, Jeep, Ram, Plymouth, and Mitsubishi applications across a wide range of model years. It uses a polyacrylate sealing material and a clockwise-spiral lip design to help maintain a consistent seal at the torque converter interface.

With a 1.500-inch shaft diameter, 2.253-inch outside diameter, and 0.360-inch width, this National oil seal is sized for specific transmission housings and bore dimensions. The Redicoat finish is included on the sealing surface for installation support and initial sealing performance.

Key Features

• Part number: 331228H
• Automatic transmission torque converter seal / oil seal
• Polyacrylate sealing material
• Clockwise-spiral lip design
• Redicoat finish
• Inside diameter: 1.500 in. / 38.100 mm
• Outside diameter: 2.253 in. / 57.230 mm
• Width: 0.360 in. / 9.150 mm
• Housing bore: 2.249 in. / 57.120 mm

Detailed Description

National has supplied sealing solutions for more than 75 years, and the 331228H reflects that focus on transmission sealing accuracy. This seal is engineered around the listed dimensions and material specification, making it a direct replacement choice for many Chrysler 41TE, 40TE, 42RLE, 42LE, 31TH, 31RH, 31AE, 42RH, A500, A999, A998, A904, and related applications shown in the fitment data. It is commonly searched for as a torque converter seal for Dodge Journey, Dodge Avenger, Jeep Wrangler, and Chrysler Sebring applications.

This part cross-references Four Seasons 14940 for the same application.

What It Helps Address

• Transmission fluid leakage at the torque converter seal area
• Seal wear from age, heat, and fluid exposure
• Drips or seepage around the transmission housing bore
• Loss of sealing integrity during torque converter service
• Replacement needs during transmission rebuild or overhaul

Installation Notes and Tips

• Verify shaft, housing bore, and width dimensions before installation.
• Inspect the torque converter hub and sealing surface for scoring or wear.
• Clean the bore and surrounding area thoroughly before pressing in the seal.
• Use the correct transmission-specific fitment, especially on Chrysler 41TE, 40TE, 42RLE, and 42LE applications.
• Confirm front-position applications where listed, including Jeep Wrangler, Jeep Liberty, Dodge Nitro, and Dodge Dakota.

Quality Assurance

National is recognized for premium sealing solutions and long-term industry experience in automotive sealing products. The 331228H is built to the listed dimensional and material specifications for transmission service work.