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asa
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symptoms of a bad bearing in a rear-end?

i've got some vibration from the rear-end of my truck, a '93 F150, especially if i hold the speed around 60-65, but also as i slow down (coasting or braking, and at other speeds but it's worse at about 60-65), i've had the tires balanced and rebalanced, the u-joints are solid (and relatively new actually), the balancing weights are on the driveshaft and haven't been damage
about the only thing i can really think of would be a bad spot in the bearings (especially as it reminds me of what happened with my 7.25" rear in the mustang before i upgraded to an 8")


anyone have any ideas as to what else might be the issue?
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Old 11-02-2009, 06:18 PM asa is offline  
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chuckybob
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is it a vibration or a shimmy?
Old 11-02-2009, 08:14 PM chuckybob is offline  
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punisher
 
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Bearings in the rear end really don't cause vibrations or shimmys. Axle bearings and carrier bearings can cause a "grinding" sound. Pinion bearings cause a "whining" sound, more noticeable when accelerating, quieter when coasting.

If it was mine, I would jack up the rear, put it in neutral and spin the tires to check for out of round conditions or any type of binding.

EDIT: Check the shocks for any fluid leakage as well. A bad shock will let the rear axle bounce at certain speeds/frequencies.
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Last edited by punisher; 11-03-2009 at 02:12 PM..
Old 11-03-2009, 01:57 PM punisher is offline  
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asa
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Quote:
Originally Posted by chuckybob View Post
is it a vibration or a shimmy?
so we're on the same page, what are your definitions of each?
feels something like a flat-spot, whole truck shakes, not as bad as if i was going down a washboard dirt road, but it's still bad enough to notice
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Old 11-03-2009, 06:43 PM asa is offline  
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chuckybob
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vibration doesnt move the wheel, even if it can be felt through the wheel. shimmy does move the wheel.
Old 11-03-2009, 08:01 PM chuckybob is offline  
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asa
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Quote:
Originally Posted by chuckybob View Post
vibration doesnt move the wheel, even if it can be felt through the wheel. shimmy does move the wheel.

vibration can move the wheel, if the front tires are out of balance bad enough it'll hop and shake the wheel

but no, the wheel doesn't move, the whole truck sorta shudders, but nothing specific is jumpin an jivin
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Old 11-03-2009, 08:06 PM asa is offline  
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chuckybob
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im wondering if its not the differential. its really unlikely to have failed, but it could also explain the symptoms.
Old 11-03-2009, 09:40 PM chuckybob is offline  
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