The Timken 4278 Rear Differential Pinion Seal is a critical component for maintaining the integrity of your vehicle’s drivetrain. Designed specifically for a wide range of Ford and Lincoln models, this high-quality grease/oil seal prevents harmful contaminants from penetrating the differential, thereby minimizing the risk of leakage and subsequent damage to internal components. Ideal for both DIY enthusiasts and professional mechanics, this pinion seal ensures your vehicle's differential remains properly lubricated and efficient, helping to enhance overall performance and longevity. Installing this Timken pinion seal is essential if you’re noticing any noise or leaking from the rear differential, or if you're conducting routine maintenance on your transmission system. Featuring an internal contamination exclusion system, the 4278 seal is built to withstand harsh conditions, making it a reliable choice for ensuring your vehicle operates optimally. Timken’s dedication to precision engineering and high-quality materials ensures enhanced durability and performance.

• Prevents contamination and leakage
• Compatible with select Ford & Lincoln models
• Easy installation for DIY and pros
• Precision engineering for optimal fit and performance
• Durable construction for long-lasting use

Part Number:	4278
Compatible Models:	Ford & Lincoln
Dimensions:	3.400 in. x 3.400 in. x 1.800 in.
Weight:	0.2000 lbs.
Material:	High-quality Timken engineering

• 1985-1998 Ford E-350 Econoline | Position: Rear | Note: 10.25 in., 10.5 in. Ring Gear
• 1985-1998 Ford E-350 Econoline Club Wagon | Position: Rear | Note: 10.25 in., 10.5 in. Ring Gear
• 1985-1997 Ford F-350 | Position: Rear | Note: 10.25 in., 10.5 in. Ring Gear
• 1988-1994 Ford F-59 Commercial Stripped Chassis | Position: Rear | Note: 10.25 in., 10.5 in. Ring Gear
• 1998 Ford F-250 | Position: Rear | Note: 10.5 in. Ring Gear - From 1/1998
• 1999-2004 Ford F-350 Super Duty | Position: Rear | Note: 10.5 in. Ring Gear
• 1999-2008 Ford F-450 Super Duty | Position: Rear | Note: 10.5 in. Ring Gear
• 2000-2002 Ford E-150 Econoline | Position: Rear | Note: Exc Limited Slip Differential (Ring Gear 9.75 in.)
• 2000-2005 Ford Excursion | Position: Rear | Note: 10.5 in. Ring Gear
• 2000-2008 Ford Expedition | Position: Rear | Note: 9.75 in. Ring Gear
• 2002 Ford F-150 | Position: Rear | Note: 10.25 in. Ring Gear
• 2005-2010 Ford F-150 | Position: Rear | Note: Exc Limited Slip Differential (Ring Gear 9.75 in.)
• 2003-2005 Ford E-350 Club Wagon | Position: Rear | Note: 10.5 in. Ring Gear
• 2003 Lincoln Aviator | Position: Rear | Note: 9.75 in. Ring Gear
• 2004-2005 Ford E-350 Super Duty | Position: Rear | Note: 10.5 in. Ring Gear
• 2004 Ford F-150 | Position: Rear | Note: Exc Limited Slip Differential (Ring Gear 10.25 in.)
• 2013 Ford F-150 | Position: Rear | Note: Exc Limited Slip Differential (Ring Gear 9.75 in.)
• 2004 Ford F-150 Heritage | Position: Rear | Note: Exc Limited Slip Differential (Ring Gear 10.25 in.)
• 2005-2006 Ford F-350 Super Duty | Position: Rear
• 2005 Ford F-350 Super Duty | Position: Rear Outer | Note: 10.5 in. Ring Gear
• 2006-2008 Lincoln Mark LT | Position: Rear
• 2006 Lincoln Mark LT | Position: Rear | Note: 9.75 in. Ring Gear
• 2006 Lincoln Navigator | Position: Rear
• 2007-2008 Ford E-250 | Position: Rear | Note: 10.5 in. Ring Gear
• 2011 Ford F-250 Super Duty | Position: Rear | Note: 10.5 in. Ring Gear
• 2007-2008 Lincoln Mark LT | Position: Rear | Note: 10.25 in. Ring Gear
• 2009-2010 Ford F-250 Super Duty | Position: Rear
• 2011-2012 Ford F-150 | Position: Rear | Note: 9.75 in. Ring Gear
• 2015-2019 Ford Transit-350 | Position: Rear
• 2015-2019 Ford Transit-350 HD | Position: Rear
• 1988-1997 Ford F-53 Motorhome Chassis | Position: Rear | Note: 10.25 in., 10.5 in. Ring Gear
• 1990-1997 Ford F-Super Duty | Position: Rear | Note: 10.25 in., 10.5 in. Ring Gear
• 1996-1998 Ford Econoline Super Duty | Position: Rear | Note: 10.25 in., 10.5 in. Ring Gear
• 1998 Ford E-250 Econoline | Position: Rear | Note: 10.5 in. Ring Gear - From 1/1998
• 1998-2020 Lincoln Navigator | Position: Rear | Note: 9.75 in. Ring Gear
• 1999-2002 Ford E-350 Econoline Club Wagon | Position: Rear | Note: 10.5 in. Ring Gear
• 1999 Ford E-450 Econoline Super Duty | Position: Rear | Note: 10.5 in. Ring Gear
• 1999 Ford Econoline Super Duty | Position: Rear | Note: 10.5 in. Ring Gear
• 1999-2002 Ford F-550 Super Duty | Position: Rear | Note: 10.5 in. Ring Gear
• 2000-2002 Ford E-150 Econoline Club Wagon | Position: Rear | Note: Exc Limited Slip Differential (Ring Gear 9.75 in.)
• 2000-2020 Ford F-150 | Position: Rear
• 2000-2001 Ford F-150 | Position: Rear | Note: Exc Limited Slip Differential (Ring Gear 9.75 in.)
• 2000-2004 Ford F-250 Super Duty | Position: Rear | Note: Exc DANA AXLE
• 2000-2004 Ford F-350 Super Duty | Position: Rear Outer
• 2000-2004 Ford F-450 Super Duty | Position: Rear
• 2000-2002 Ford F-550 Super Duty | Position: Rear
• 2003 Ford F-150 | Position: Rear | Note: Exc Limited Slip Differential (Ring Gear 9.75 in.)
• 2007-2010 Ford F-350 Super Duty | Position: Rear | Note: 10.5 in. Ring Gear
• 2006-2007 Ford F-350 Super Duty | Position: Rear Outer
• 2005-2007 Ford F-550 Super Duty | Position: Rear | Note: 10.5 in. Ring Gear
• 2002 Lincoln Blackwood | Position: Rear | Note: 9.75 in. Ring Gear
• 2003-2007 Ford E-150 | Position: Rear | Note: Exc Limited Slip Differential (Ring Gear 9.75 in.)
• 2003-2005 Ford E-150 Club Wagon | Position: Rear | Note: Exc Limited Slip Differential (Ring Gear 9.75 in.)
• 2003-2004 Ford F-550 Super Duty | Position: Rear | Note: Exc DANA AXLE
• 2004 Ford F-150 Heritage | Position: Rear
• 2005-2008 Ford F-250 Super Duty | Position: Rear | Note: 10.5 in. Ring Gear
• 2009-2020 Ford Expedition | Position: Rear
• 2015-2020 Ford Mustang | Position: Rear
• 2015-2019 Ford Transit-150 | Position: Rear
• 2015-2019 Ford Transit-250 | Position: Rear