When they go you'll also hear/feel like your going over rumble strips right after you hit a pothole or a rough spot in the road. Wheel play is another sign they're gone as long as it doesn't come from bad ball joints. Since your doing the brakes anyway I'd go ahead pull the hub/bearing assemblies - its not that much more work. There is a bearing in the back of the hub/bearing assembly that should be greased/checked about every 55-60K anyway. I don't know of anyone who's ever sucessfully taken one of these assemblies apart and re-greased the bearings. (The hub is a sealed unit)
If they are shot you'll have to get the whole assembly + don't forget to buy the studs - both the wheel & hub mounting studs. They don't always come with them and they can be a pain to get out of the old hub assembly anyway.
When you buy the wheel studs make sure they match what's already on your truck - Ford put two different wheel stud thread pitches out there so you've only got a 50/50 shot at getting the right ones to match your lug nuts to begin with.
Last edited by dagren99; 12-27-2007 at 02:47 PM.
Reason: left something out
Yup - it would. The hub wobbling around = axle stub shaft wobbling. Guess this is another way you could tell that the hub bearings are going. The axle shaft passes through & rides on the smaller bearing in the back of the hub.
dynatrac setup also saves wear and tear on diff, plus better mpg's. I have been reading up on the kit latley and it sounds great even at 1800.00. I am sure someone who has this setup will chime in. on the other hand you could probably buy unit bearings for the life of your truck for that price also.