Front hub / u-joint question
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Tuned
Joined: Feb 2003
Posts: 355
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From: Oregon
Front hub / u-joint question
I have an '04 F250 4x4 with manual locking hubs and manual transfer case. Somebody once told me that the steering knuckle u-joint, axle, and driveshaft will rotate at higher speeds with the hubs unlocked due to centrifugal force. I don't have a way to prove/disprove this theory. Opinions?
I'm in the process of locating a weird clatter that starts around 55MPH and up. Hubs locked/unlocked, in 2WD or 4WD, coasting or accelerating, applying the brakes, nothing makes a difference. I'm now replacing the rear driveshaft u-joints and carrier bearing as a preventive measure, since they have 200K on them. I have the driver's side front hub off, since the noise seems to be coming from that side. Didn't see anything abnormal with the needle bearing or stub shaft.
I'm in the process of locating a weird clatter that starts around 55MPH and up. Hubs locked/unlocked, in 2WD or 4WD, coasting or accelerating, applying the brakes, nothing makes a difference. I'm now replacing the rear driveshaft u-joints and carrier bearing as a preventive measure, since they have 200K on them. I have the driver's side front hub off, since the noise seems to be coming from that side. Didn't see anything abnormal with the needle bearing or stub shaft.
Laughing Gas
Joined: Feb 2014
Posts: 817
Likes: 297
From: KY
Have them explain that one when there is no mechanical connection between those parts. In some cases "oil drag" can make things rotate at a slower speed but not faster that the driven part if not locked in. If the truck is parked, hubs unlocked, out of 4x4 you should be able to reach in a rotate those front axles/U joints by hand with some resistance from the grease,seals and whatever else. If not you have other issues.
Lead Driver
Joined: May 2003
Posts: 9,303
Likes: 48
From: Lyndonville, Vermont
Ya nothing turns at all when warm...Unless something is damaged like a wheel hub bearing or locking hub...Just have someone look underneath when rolling to make sure all isn't moving. Or in 2wd you can turn the front driveshaft by hand easily with hubs unlocked. Also jack up the front and turn each wheel and make sure axle doesnt spin.
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ViperGreg
1987 - 1996 F150 & Larger F-Series Trucks
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Sep 29, 2021 05:59 PM
