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Old 03-23-2013, 07:29 PM Rookie

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Question Hub problems????

Ok I have a 2000 f250 with manual locking hubs and 4x4 on the floor and I am completely out of ideas. When the truck is in 2 wheel drive and the hubs are locked in there is no problem at all, also 4 wheel drive works fine and no noises. The problem is that when I disengage the hubs to freewheel there is an awful sound almost like grinding and vibrations coming from front end. My only conclusion was that my hubs weren't completely unlocking and were trying to but never did which is why it would grind and vibrate because as soon as I locked the hubs back in, no noises or vibrations at all. So I just replaced the hubs with new ones and it still does the same thing. Please help! Oh and it's not constant, it comes and goes which I what led me to believe it was the hubs trying to unlock so now I have brand new hubs and no change.
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Old 03-24-2013, 06:18 AM
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What you're describing is Classic Needle Brgs failure. When locked, the stub axle is spinning with the wheel and those brgs are not necessary or even turning. When Unlocked they spin against a stationary stub axle and growl.

New needle brgs come installed in the new hub assembly (but separately replaceable too) and if you've replaced the hub already your needles are also new. So, next I'd be thinking the area of the stub axle (kinda the race the needles ride against) might be totally shot from the abuse it took with the old ones. Take a look at your stub axle, it might need to be replaced....

Welcome to guzzle's 4x4 Needle Bearing Maintenance Web Page
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Old 03-24-2013, 07:33 PM Rookie

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Ok thanks, I'm going to look into that tomorrow
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