QU40473 Ford Super Duty® Flanged Pinion Seal

QU40473 Ford Super Duty® Dana 80 Flanged Pinion Seal is a genuine original equipment replacement Seal for 2001.5-2010 Ford Super Duty® F-350 Dana 80 Dual Rear Wheel rear axles. Outside diameter of Seal Shell has factory applied bead of sealant to eliminate leaks between the shell and axle housing. QU40473 also fits 2017-up Ford Super Duty® F250, F350, F450, F550 with either Dana M275 or Dana M300 single or dual rear wheels rear axles. USA Made.

Need More Info? Use the handy Links below to access over 40 years of Dan's product and vehicle specific Tech Notes to easily get the information you need for your vehicle's repair, maintenance, or upgrade project!

Dan the Gear Man® Tech Notes:
2001-Up
Oil Seal Leaks
Matching Parts
Applications

Tech Note 1: 2001-Up
2001 and Later Ford axles use this deep shell seal that has a metal flange that limits seal installation depth. Early and mid production Ford Dana 80 rear axles (1988-2000) use shallow shell pinion seals (QU40258, QU40302) that seat against a step in the housing bore when fully installed and have a clearance groove for the pinion yoke slinger.

Tech Note 2: Oil Seal Leaks
Oil seal leaks can be very vexing with rear axle applications. The most common cause is simply the axle vent system is plugged. When this happens, pressure builds up as the axle warms up during operation until the weakest seal fails. The cure is easy, clean the vent hose and/or fittings (usually found on the left axle tube). Another common cause is a seal wears a groove in the pinion yoke. In these cases, replacing the yoke is the way to go.
Installing stainless steel wear sleeves marketed by most major seal manufacturers would seem like a viable alternative, unfortunately, this type of repair rarely lasts long. Why? A worn sleeve increases the diameter of the yoke or spindle by 0.020"-0.040". When a stock seal, engineered for the original yoke or spindle diameter is installed over a wear sleeve, the larger installed diameter of the sleeve causes the seal to run hotter and wear much faster than normal. Result: Rapid seal wear and presto! the oil leak is back.

Tech Note 3: Matching Parts
Matching parts for QU40473 Pinion Seal:
QU40709 U-Joint Strap and Bolt Kit (2001-2002 with End Yoke)
QU20103 Driveshaft Flange to Pinion Flange Bolt (all with companion flange)
QU40061 Pinion Nut
QU40250 Pinion Washer
QU10636 Pinion End Yoke (2001-2002 partial)
QU40095 Outer Pinion Slinger
QU40218 Limited Slip Lubricant

Applications
Ford:
F-350 Super Duty 4x4 DRW Trucks with Dana 80 Rear Axles: 2001.5, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
M275: 2017, 2018, 2019
M300: 2017, 2018, 2019