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There are two different bearings in this hub assembly, and each does different things.
The first is the main wheel bearings, which are not normally greaseable. Those are the ones that we shoot grease at through the ABS sensor hole. The hub does not have to be removed to do that, just the brake caliper. I do these every year because the weight of the truck sits on these bearings.
The second are the needle bearings. They are what supports the "stub axle" which is the drive axle from the U-joint outwards into the hub lock assembly. To lube those the entire assembly has to come off the truck. Study this to get an idea of what's involved: http://www.guzzle7pt3.com/nblube.php
These get greased every 60,000 miles. Only the inner part of the stub axle is supported by these.
There is yet another bearing in these assemblies, and it's located in the hub locking mechanism, and occasionally needs re-packing, too. Here's how to do that one: http://www.guzzle7pt3.com/allube.php
It supports the outer part of the stub axle.
Pop
Pop's advice still useful to the newcomers!
Had to buy the 4 studs for the Timken bearing - last price mentioned with $3 each, glad to see a healthy price increase for Ford. Shopping bag made me wonder though...
That bag (photo below) should be either laughing or crying. At least I didn't buy the bearing from Ford...
Pop, do you think stuffing all that grease down the ABS hole is a good idea?