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Old 09-24-2005, 05:37 PM
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Ford 9 inch rear end... whinning noise???

My 9 inch rear end is whinning at about 30 mph. I noticed a leak in the front bearing. Is it possible the bearing needs replaced and that would cause the whinning noise...??? No clunk or rough noise just small whine noise like road noise from tires on pavement.


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Old 09-24-2005, 07:45 PM
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Differential noise

One thing to look at would be your pinion bearings. Pinion bearings usually make noise when they are under load, when you are on the gas. If the noise changes if you on the gas or not I would look there first. When you are under acceleration, the ring and pinion gear are pushing away from each other, this puts a lot of load on the pinion bearings. If the front seal is leaking this may also be a sign of the bearings being loose and the seal not being able to seal to a sloppy pinion.

Rick
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Old 09-26-2005, 07:23 PM
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Thanks Ricky for the reply!!

I pulled the unit out today and will take it to a local rear end builder. Talked to him on the phone and he said it is most likely the gears are worn. Probaly new set of gears and bearings are due??? .................................


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Old 09-26-2005, 07:53 PM
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Differential noise

I am sure the visual inspection will show where the problem is. If he is putting in new gears you should put in new bearings at the same time, then you know its all in great shape. Let us know how it turns out.

Rick
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Old 09-26-2005, 11:49 PM
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Be sure and have him put a solid spacer in it. He has to replace it anyway.
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Old 09-28-2005, 01:03 PM
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smart choice to have it replaced. my rearend did the same thing shortly before it exploded. Wornout bearing led to the seal wearing through, all the oil leaked out, and then you can guess what happened without any oil in there...

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