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Old 09-18-2011, 06:48 AM
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Pinion bearing ?

I am wondering if I have a pinion bearing going bad or something in the rear.I have a noise at about 60-63 mph not loud but I hear at about 1900 /2000 rpm,the u joints and center bearing are fine.A few years back ,I had a pinion seal go out ,they replaced the seal now I am wondering if the preload on the nut was done wrong and if this could be the problem ?,when I grab the the flange and turn it there is some play more then I think it should be,but that would 'nt be the pinion bearing at least thats what I am thinking ?

Any ideas ?? Thanks...
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Old 09-18-2011, 05:20 PM
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What's the noise sound like?

A bad pinion bearing will "whirl"/"growl" ... usually you can hear it at all speeds.
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Old 09-18-2011, 05:23 PM
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best thing to do is pull the carrier, you'll be able to feel it if the pinion is the problem

you should feel backlash when it meshes to the ring, but as far as in and out movement or side to side on the flange there should be none
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Old 09-18-2011, 07:30 PM
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Quote:
Originally Posted by 98SurplusExpy View Post
What's the noise sound like?

A bad pinion bearing will "whirl"/"growl" ... usually you can hear it at all speeds.
I would say maybe a low whirl,but you can barely notice if you are not listening,but only at 60 ish mph. thanks....
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Old 09-18-2011, 07:34 PM
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Quote:
Originally Posted by sinner6.0L View Post
best thing to do is pull the carrier, you'll be able to feel it if the pinion is the problem

you should feel backlash when it meshes to the ring, but as far as in and out movement or side to side on the flange there should be none

how tough are they to work on ? dont have any side to side or in and out movement.thanks
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Old 09-19-2011, 01:03 PM
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Pinion bearing noise is usually during off load coast or decel only. You are correct in the pinion nut being tightened could have crushed the chrush sleeve some more, OR not tightened enough and there is not enough pinion bearing preload now.

What you discribe does not initially sound like a pinion bearing issue though. But theres no way of telling for sure, without doing some work on it to check things out, preload, back lash, pattern, etc...
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Old 10-12-2011, 06:44 PM
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Quote:
Originally Posted by robertk View Post
Pinion bearing noise is usually during off load coast or decel only. You are correct in the pinion nut being tightened could have crushed the chrush sleeve some more, OR not tightened enough and there is not enough pinion bearing preload now.

What you discribe does not initially sound like a pinion bearing issue though. But theres no way of telling for sure, without doing some work on it to check things out, preload, back lash, pattern, etc...
When I have had pinion bearing issues it was exactly the opposite. Noise on accelaration that went away when coasting.
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