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I have a 2000 f250 sd 4wd and the driver side front hub assembly is bad I found on here some time ago a great place to buy the hub as well as an oring kit (yellow orings) but my computer has crashed and lost all of my saved websites any help as truck is down and need it to go hunting in the morning.
I replaced both of my hubs with Timken hubs. When I replaced one side at the time I ordered from Amazon, who had the best price. When I eventually replaced the other side I purchased it from Autozone.
There are vendor here who sell them as well. Just be sure to order the correct ones with course or fine thread, which ever ones are on your truck now. Where ever you buy yours, I'm sure they sell the yellow oring. If I'm not mistaken, the oring can be reused.