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There are two seals for each 1999-2004 Ford Super Duty® Model 60 front inner axle shaft. QU40244 is an oil seal that seals between the differential housing and inner axle shaft. QK4644 and QK4807 are Kits that make installing the two included QU40244 Axle Seals quick and easy, plus the tools will not damage the somewhat fragile oil seals or your axle housing. QU40243 is an external dust seal that helps keep crud from entering the axle housing tubes.
1999 to 2004 Ford Super Duty® axle shaft to knuckle seals are just about the toughest seals to install we have ever come across. The seal is of a complicated unitized design, which is easily damaged without the correct installer. In fact, the knuckle seal is virtually impossible to install without damage unless a tool like our one piece, rugged 12 pound QT1515 Knuckle Seal Installer is used to drive or press the seal on (left photo). Not only is the seal an extremely tight fit to the shaft, it also must be installed to a specific depth on both the axle shaft and in the knuckle. A damaged seal will allow water to enter and vacuum to escape. On the right shows the QT1515 Seal Installer being used to press a Knuckle Seal to the required position on an outer axle shaft. (right photo) Using QT1515 to seat the axle shaft assembly into the steering knuckle to the correct depth.
