FAG SS3447 Engine Crankshaft Seal - Rear

Rear Engine Seal for Ram and Dodge Trucks

FAG SS3447 is a rear engine seal built for specific Ram and Dodge heavy-duty truck applications. It uses a metal seal design with an auxiliary lip and Teflon sealing material to help maintain a tight seal at the crankshaft area while keeping contaminants out.

Fits 2011-2018 Ram 3500, rear. Fits 2011-2016 Ram 2500, rear. Fits 1998-2010 Dodge Ram 2500, rear. Fits 2000-2010 Dodge Ram 3500, rear. Fits 2009 Dodge Ram 2500, rear. Fits 2007 Dodge Ram 2500, rear. Fits 2006-2007 Dodge Ram 3500, rear. Fits 2001 Dodge Ram 2500, N/A. Fits 1989-1993 Dodge D250, rear. Fits 1989-1993 Dodge D350, rear. Fits 1989-1993 Dodge W250, rear. Fits 1989-1993 Dodge W350, rear.

• Brand: FAG
• Part number: SS3447
• Seal type: metal with auxiliary lip
• Sealing material: Teflon
• Bore diameter: 149.987 mm / 5.905 in
• Seal outside diameter: 150.444 mm / 5.923 in
• Seal width: 14.503 mm / 5.098 in
• Cross-reference: National 39805

Detailed Product Description

FAG SS3447 is engineered to meet vehicle-specific sealing requirements for rear crankshaft applications on Ram 2500, Ram 3500, and earlier Dodge Ram truck platforms. The metal construction and auxiliary lip help support sealing performance at the engine rear main area, while the Teflon sealing material is selected for demanding service conditions. With precise bore, outside diameter, and width dimensions, this seal is built for applications where correct fit and sealing integrity matter.

This part cross-references National 39805 for the same application.

What This Seal Helps Address

• Rear main seal oil leakage at the crankshaft area
• Contamination from dirt, dust, and moisture entering the seal area
• Loss of grease or lubricant at the bearing and seal interface
• Seal wear caused by incorrect dimensions or poor sealing contact
• Service issues on Ram 2500 and Ram 3500 rear seal applications

Installation Notes and Tips

Verify the vehicle year, model, and rear position before ordering FAG SS3447. Confirm bore diameter, outside diameter, and seal width against the original part and the application listing. Clean the sealing surface thoroughly and inspect the crankshaft and housing for wear, scoring, or contamination before installation.

For 2001 Dodge Ram 2500 listings marked N/A, confirm the exact engine and seal application before installation. This part is also referenced under part number SS3447, which can help when matching service records or catalog listings.

Quality Assurance

FAG designs seals to meet vehicle manufacturer specifications and works with suppliers to maintain its quality standards. The SS3447 is built for demanding wheel-end and sealing service requirements, with materials selected to support long-term sealing performance in the specified Ram and Dodge truck applications.