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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Fri, May-03-2013, 06:28:04 AM   #1
paffy
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Default differential whine

I just got a rebuilt diff with 3.91 ring & pinion installed.

The car sounds like it's got straight cut gear gearbox. Both loaded and unloaded drive-train makes whining noise. When I find neutral throttle to minimize the torque on the driveshaft, the whine goes away, so I'm 95% sure it's the R&P.

Is this normal ? Will it go away ? The gears are not polished AFAIK.

P.
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Old Fri, May-03-2013, 04:43:08 PM   #2
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Default Re: differential whine

You hear of folks getting rid of a little bit of whine, usually just off-throttle (my car has recently started this on longer trips at expressway speeds) with fresh fluid/more friction modifier. But I don't think I've ever heard of one that whines newly installed, getting better. Further, if you drive it much at all, it is now worn in wrong and taking it back probably won't fix it. Take it back to the installer NOW is my recommendation.

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Old Fri, May-03-2013, 05:12:23 PM   #3
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Default Re: differential whine

Did you install new bushings? Oem or poly?
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Old Fri, May-03-2013, 05:23:18 PM   #4
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Default Re: differential whine

The BMW gearsets use super tight backlash tolerances, if the gear was previously used (or setup too loose) it will whine like crazy.
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Old Fri, May-03-2013, 05:42:10 PM   #5
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Default Re: differential whine

Did you replace all bushings? Also, the gears might be set to tight (not enough gap between teeth). These are the only things that will cause whine. Take back asap as the gears will wear wrong and you are screwed. Usually gears break in within 700 miles.
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Old Fri, May-03-2013, 06:52:38 PM   #6
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Default Re: differential whine

If you put in solid bushings, they will transmit the noise by themselves.

If you're on OEM bushings, then I'd point to the R&P install, and have it fixed asap.
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Old Fri, May-03-2013, 06:54:46 PM   #7
paffy
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Default Re: differential whine

The differential is a fresh rebuild from Turner. They just told me to expect some whine before it breaks in and change diff fluid after 1200 miles.

I've put 30 miles on it so far, I guess I will be taking it back to the shop just to make sure.

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Old Sun, May-05-2013, 07:11:12 AM   #8
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Default Re: differential whine

noise start at 0:30

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Last edited by paffy; Sun, May-05-2013 at 07:15:17 AM.
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Old Sun, May-05-2013, 08:00:59 AM   #9
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Default Re: differential whine

Take it back to the installer NOW is my recommendation.
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Old Sun, May-05-2013, 12:48:34 PM   #10
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Default Re: differential whine

I agree 100% awful and needs to be properly diagnosed. The sound I do not think can be stopped with the BMW XFM booster...but you can try.
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Discussing differential whine in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)