FAG SS4040 Automatic Transmission Seal - Front Inner or Rear

Automatic Transmission Seal for OE-Style Fitment

FAG SS4040 is an automatic transmission seal built with a metal spring design and nitrile sealing material for dependable sealing performance. It is specified for select Chrysler, Dodge, Plymouth, and BMW applications, including rear and front inner positions where precise sealing is critical.

Use SS4040 when you need a transmission seal sized to the application and built to help maintain fluid control at the sealing surface. The part number SS4040 is also referenced in OE-style replacement searches for several late-1990s and early-2000s vehicles.

Key Features

• Brand: FAG
• Part number: SS4040
• Seal type: metal; spring
• Sealing material: nitrile
• Bore diameter: 2.244 in. / 56.998 mm
• Seal outside diameter: 2.25 in. / 57.15 mm
• Seal width: 1.575 in. / 40.005 mm
• Designed for transmission sealing applications in select Chrysler, Dodge, Plymouth, and BMW vehicles

Detailed Description

FAG SS4040 is engineered to meet vehicle manufacturer specifications using materials selected for sealing consistency and durability. The nitrile sealing element works with a metal spring design to maintain contact at the sealing lip, helping control transmission fluid at the seal interface. This makes SS4040 a practical choice for service work on vehicles such as the Chrysler Town & Country, Dodge Caravan, Dodge Grand Caravan, Plymouth Grand Voyager, Plymouth Voyager, and BMW 318i, 323i, 328i, 528i, and Z3 applications listed below.

This part cross-references Bosch 15830 for the same application.

Vehicle Fitment

• Fits 1998-2000 Chrysler Town & Country, Front Inner. Notes: Schaeffler Seal Global Number 413 4040 100.
• Fits 1997-2000 Chrysler Town & Country, Rear. Notes: Schaeffler Seal Global Number 413 4040 100.
• Fits 1999-2000 Dodge Caravan, Rear. Notes: Schaeffler Seal Global Number 413 4040 100.
• Fits 1999-2000 Dodge Grand Caravan, Rear. Notes: Schaeffler Seal Global Number 413 4040 100.
• Fits 1998-2000 Plymouth Grand Voyager, Rear. Notes: Schaeffler Seal Global Number 413 4040 100.
• Fits 1998-2000 Plymouth Voyager, Rear. Notes: Schaeffler Seal Global Number 413 4040 100.
• Fits 1996-1999 BMW 318i, Rear. Notes: 318iC, 323iC, 328iC; Schaeffler Seal Global Number 413 4040 100.
• Fits 1996-1999 BMW 318is, Rear. Notes: 318iC, 323iC, 328iC; Schaeffler Seal Global Number 413 4040 100.
• Fits 1996-1999 BMW 318ti, Rear. Notes: 318iC, 323iC, 328iC; Schaeffler Seal Global Number 413 4040 100.
• Fits 1997-1999 BMW 323i, Rear. Notes: 318iC, 323iC, 328iC; Schaeffler Seal Global Number 413 4040 100.
• Fits 1998-1999 BMW 323is, Rear. Notes: 318iC, 323iC, 328iC; Schaeffler Seal Global Number 413 4040 100.
• Fits 1996-1999 BMW 328i, Rear. Notes: 318iC, 323iC, 328iC; Schaeffler Seal Global Number 413 4040 100.
• Fits 1996-1999 BMW 328is, Rear. Notes: 318iC, 323iC, 328iC; Schaeffler Seal Global Number 413 4040 100.
• Fits 1996-1999 BMW 528i, Rear. Notes: 318iC, 323iC, 328iC; Schaeffler Seal Global Number 413 4040 100.
• Fits 1996-1999 BMW Z3, Rear. Notes: 318iC, 323iC, 328iC; Schaeffler Seal Global Number 413 4040 100.
• Fits 1990-1994 BMW 325i, Rear. Notes: Schaeffler Seal Global Number 413 4040 100.
• Fits 1990-1994 BMW 325is, Rear. Notes: Schaeffler Seal Global Number 413 4040 100.

Common Issues This Seal Can Address

• Transmission fluid leakage at the seal surface
• Contamination entry from dirt, dust, or moisture
• Grease or fluid loss at the bearing or seal area
• Wear-related sealing loss in serviceable drivetrain components
• Replacement needs on select Chrysler, Dodge, Plymouth, and BMW rear applications

Installation Notes and Tips

Verify bore diameter, outside diameter, and seal width before installation to confirm the seal matches the housing and shaft dimensions. Inspect the sealing surface for scoring, corrosion, or debris before fitting the new seal, and make sure the lip seats evenly during assembly. For BMW 318i, 323i, 328i, 528i, Z3, and Chrysler Town & Country applications, confirm the exact position listed in the fitment data before ordering.

Quality Assurance

FAG designs seals to meet vehicle manufacturer specifications and works with suppliers to maintain its quality standards. The SS4040 uses a nitrile sealing element with a metal spring construction for controlled sealing performance in the listed applications.