noise from rear - Pontiac GTO Forum
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post #1 of 13 (permalink) Old 12-16-2014, 03:08 PM Thread Starter
 
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noise from rear

125K on gto and there is a hum at 40 mph especially when turning hard right. Noise is there with no load (ie foot off gas and coasting). Changed rear oil and made no difference. I was thinking a rear wheel bearing but those are radial load bearings so I would not think they would not make noise side to side. So.. that leaves the CV's, right?
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post #2 of 13 (permalink) Old 12-16-2014, 04:36 PM
 
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Maybe the side gears in the diff.
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post #3 of 13 (permalink) Old 12-16-2014, 06:53 PM
 
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I second that emotion
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post #4 of 13 (permalink) Old 12-17-2014, 11:21 AM Thread Starter
 
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Side gears? What exactly are you talking about? Do you mean case bearings or pinion gears?
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post #5 of 13 (permalink) Old 12-17-2014, 11:33 AM
 
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The side gears are in the differential on the posi unit.
You either rebuild the posi or replace it.
Now might be a good time to upgrade.

GForce might still have some spools left if you want
to get away from the posi.
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post #6 of 13 (permalink) Old 12-17-2014, 12:23 PM
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I'd lean more towards the wheel bearings. The diff has slop in the stubs and half shafts and I don't think there is much side loading with it on turns.

2004 Blk/Rd M6
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post #7 of 13 (permalink) Old 12-17-2014, 01:21 PM
 
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I'm just sayin'.
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post #8 of 13 (permalink) Old 12-17-2014, 06:39 PM
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May be but it could also be the half shaft CVs. Diagnosing over the internet is fraught with guessing.

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post #9 of 13 (permalink) Old 12-17-2014, 08:50 PM
 
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Of course.

But the way he described it is very similar to my side gears going out.

Took forever to find it.
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post #10 of 13 (permalink) Old 12-17-2014, 09:53 PM Thread Starter
 
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I have a subscription to ALLDATA and its pointing to the differential, noise on turns. The wheel bearings are radial loading, not side loading. Inside the carrier are tapered bearings, ie. side loading. Dealer wants $7K for the carrier and I am not sure I want some goober rebuilding my unit. What options and costs do I have?
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