National 2465 Automatic Transmission Extension Housing Seal

Automatic Transmission Extension Housing Seal

National 2465 is an automatic transmission extension housing seal built with nitrile sealing material for controlled fluid sealing at the transmission tail housing. It is a Redi-Coat treated oil seal from National’s Series 2000 line, sized for a 1.680 in shaft and a 2.500 in housing bore.

Use this seal when servicing Chrysler and Dodge automatic transmission applications that require a precise extension housing seal, including Jeep Grand Cherokee and Dodge Dakota fitments. National 2465 is also referenced for select Dodge Ram and Durango applications where the transmission output area needs a reliable sealing surface.

• Nitrile sealing material for transmission fluid resistance
• Redi-Coat surface treatment for easier initial sealing
• Inside diameter: 1.680 in / 42.670 mm
• Outside diameter: 2.506 in / 63.650 mm
• Thickness: 0.421 in / 10.693 mm
• Flanged outside diameter: 2.850 in / 72.390 mm
• Overall width with side lip: 1.535 in / 38.990 mm
• Oil seal part description, Series 2000

Detailed Fitment and Application

National 2465 is an automatic transmission extension housing seal used to seal the extension housing at the transmission output area and help maintain fluid control in the tailshaft section. It is listed for 2001-2006 Aston Martin Vanquish with Tremec T56 transmission, 2000-2004 Aston Martin DB7 with Tremec T56 transmission, and multiple Dodge, Jeep, and Mitsubishi applications including 1994-2004 Jeep Grand Cherokee, 1997-1999 Dodge Dakota, and 1999 Dodge Durango. This part number 2465 also cross-references SKF 16725 for the same application.

What This Seal Helps Address

• Transmission fluid seepage at the extension housing
• Leakage around the output shaft seal area
• Worn or hardened original nitrile seal material
• Service replacement for tail housing sealing maintenance
• Fluid loss that can affect transmission cleanliness around the rear case area

Installation Notes and Tips

Inspect the housing bore, shaft surface, and seal lip area before installation. Clean the sealing surfaces thoroughly and verify the seal dimensions match the transmission application before pressing the seal into place. For best results, confirm the transmission type noted in the fitment data, such as Chrysler A500, 42RH, 42RE, 44RE, New Process 4500, New Process 5600, or Tremec T56, before installing National 2465.

Quality Assurance

National has supplied sealing solutions for more than 75 years and continues to develop sealing components for modern vehicle service needs. Part number 2465 is built as a precision oil seal for transmission sealing applications and is backed by National’s long-standing manufacturing experience.