FAG SS3429 Engine Crankshaft Seal - Rear

Engine Crankshaft Seal for Ford Rear Applications

FAG SS3429 is a metal engine crankshaft seal built for rear-position Ford applications that require precise sealing at the crankshaft. It uses a Teflon sealing material and dimensions matched to the listed applications, helping maintain a tight seal where engine oil control is critical.

Compatible With Ford E-350 Econoline, E-350 Econoline Club Wagon, E-350 Club Wagon, E-350 Super Duty, Excursion, F-250, F-250 HD, F-250 Super Duty, F-350, and F-350 Super Duty rear applications across the listed model years. This part number, SS3429, is also referenced under National 5723 and SKF 43767 for the same application.

Key Features

• Brand: FAG
• Part Number: SS3429
• Engine crankshaft seal for rear installation locations
• Metal seal type for durable housing support
• Teflon sealing material for controlled sealing contact
• Bore diameter: 5.255 in. (133.477 mm)
• Seal outside diameter: 5.26 in. (133.604 mm)
• Seal width: 4.375 in. (18.999 mm)

Product Details

FAG SS3429 is specified for rear crankshaft sealing on Ford trucks and vans from 1988 through 2003, including diesel and direct-injection configurations noted in the fitment data. The seal dimensions and material selection are important for maintaining proper crankshaft sealing performance, reducing oil leakage at the rear of the engine, and supporting consistent engine operation in high-mileage service.

Fits 2003 Ford E-350 Club Wagon, rear. Fits 2001-2003 Ford E-350 Super Duty, rear. Fits 2000-2003 Ford Excursion, rear. Fits 1999-2003 Ford F-250 Super Duty, rear. Fits 1999-2003 Ford F-350 Super Duty, rear, including direct injection applications. Fits 1999-2002 Ford E-350 Econoline Club Wagon, rear. Fits 1988-1998 Ford E-350 Econoline, rear. Fits 1988-1998 Ford E-350 Econoline Club Wagon, rear. Fits 1997 Ford F-250 HD, rear. Fits 1994-1997 Ford F-350, rear, including direct injection applications. Fits 1994-1996 Ford F-250, rear.

Common Issues This Seal Can Address

• Rear crankshaft oil leakage
• Oil seepage around the engine rear main seal area
• Contamination entering the sealing interface from dirt, dust, or moisture
• Loss of grease or lubricant retention at the bearing/seal interface
• Seal wear in high-mileage Ford rear engine applications

Installation Notes and Tips

Verify the seal dimensions and vehicle application before installation, especially on Ford E-350, F-250, F-350, and Excursion rear applications. Inspect the crankshaft sealing surface for wear, scoring, or contamination before fitting the new seal, and confirm the seal is seated squarely to avoid premature leakage. Clean the housing and surrounding area thoroughly so the Teflon sealing surface can contact the shaft properly.

Quality Assurance

FAG designs seals to meet vehicle manufacturer specifications and works with suppliers to maintain its quality standards. The seal construction is intended to protect wheel-end and sealing components from contamination and help preserve lubricant retention over the service life of the bearing or seal assembly.