The red arrow indicates where the stock, rubber vacuum lines connect. The ends of mine were brittle so I trimmed them at about 130,000 miles.

This is the yellow o-ring that seals the hub. Replacement is easy, it simply fits around the outside of the hub. These are known for going bad and causing vacuum leaks in the automatic 4x4 SuperDuty/Excursion hubs.

2-part video that shows a loose lower ball joint installed and removed.

Part 1 of the video shows pulling/pushing on the steering knuckle and illustrates how a worn/loose ball joint moves in place. When a ball joint is worn out, steering is affected because the wheels cannot maintain a straight line with the balljoint unable to stay in a set position.

Part 2 shows the old ball joint removed and how it can be moved by hand. A new ball joint is then shown in comparison and is much more firm and behaves like a ball joint should.

This video clip shows how to remove the hub from a Dana 50 frontend off of an Excursion. This also applies to an F250 or F350 frontend as well.

Removing the retaining/c-clip from the hub.

Removing the hub from the dana 50 front axle.

Remove axle c-clip from dana 50 front axle.

Remove the 3 washers from the dana 50 front axle.

Removing the drag link from the front end.

Loosen the bolts behind the lug lugs the dana 50 (this is the hub assembly, which includes your bearings, that you'll be removing).

Unbolt the electronic shift on-the-fly (ESOF) line.

Unbolt the anti-lock brake sensor (ABS).

Tap and pry loose the lug plate.

Remove the knuckle/axle washer. Note the grooves face in towards the differential.

Disconnect the electronic shift on-the-fly (ESOF) vacuum line.

Pry loose and remove axle shaft.

Remove cotter pin from the knuckle.

Unbolt the steering knuckle.

Remove the c-clip from the steering knuckle.

Remove the lower ball joint with a BFH.

Remove the upper ball joint with the proper ball joint removal tool and air tools!

Using the ball joint press and air tools, install the new ball joints. This process is fairly straight forward -- video of the top ball joint is shown but the process is repeated for both.

Remove and install the new inner axle seal. (Outer axle seal should be pressed in by a shop or dealer with a press)

Reinstall the steering knuckle.

Reinstall the axle shaft.

Reinstall lug plate, hoses, and lines.

Reinstall hub assembly and seal.

Reinstall drag link.

Reinstall brakes.