Question about 1990 Ford Ranger SuperCab

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Vibration with vehicle speed

I have a vibration that follows the vehicle speed. It is stronger at acceleration. Its accompanied by a scraping noise. It came on suddenly. I have replace the u-joints and carrier bearing, and the wheel bearings seem to be ok. I have rotated the tires and dont see any real wear.

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  • warlockk Feb 09, 2009

    Thanks for the assistance. I assume TQ means torque. The carrier on this shaft is simply pressed on to the drive-shaft then held in place with a u strap like a sway bar would be. My haynes manual doesn't list any specific torque for the bearing so I simply pressed it on with a manual press and a bit of pipe then tightened the bolts to about 25lbs/ft. All except the rear joints are press in external retaining clip, so I checked the rear straps. The joint is seated well. I don't see any damage on the shaft. It has been suggested that it may be the front breaks, however I seem to feel the vibration in the rear more. Someone also suggested the rear axel assembly. Is there a good way to eliminate some of these ideas without replacing a lot of parts?
    Oh by the way to be clear the vibration started suddenly with no dramatic noise or thump. I just got on the freeway and it started to shake. Changing the u joints was my first attempt to fix the problem. It didn't seem to make much difference at all.



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Make sure your u-joints are properly line up. there should be a slight rasied area the end caps should sit flush on. its common when someone doesnt double check the seating on U-joints. i have done this a few times. If the truck was on a rack hope that the drive shaft was not hitting the rack causing it to bend.

the scraping noise may be the carrier bearing TQ'ed too much? what did you TQ it at? they are very sensitive.
good luck, hopefully its just out of alignment with the u-joints and improperly TQ'ed bearing.
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Posted on Feb 09, 2009


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