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Old 07-30-2013, 02:42 PM   #1
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Default What gear lube for a whining set of gears

I was wondering what gear lube you would recommend for a rear that has some gear whine. I was looking at AMS and was wondering what kind of luck you had with the road race/drag race lube.
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Old 07-30-2013, 04:46 PM   #2
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Gear lube is most likely NOT going to fix a rear end gear whine. The gear noise is mostly always the result of an impropery set up ring and pinion or damaged ring/pinion tooth faces (scoring)

You can change the lubricant but, i seriously doubt that it will eliminate it. Check with AMSOIL. They have a very good 75/90 weight oil with the correct limited slip addative.

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Old 07-30-2013, 04:55 PM   #3
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I am not trying to fix it but quiet it down some. Even a little is better than nothing. It is an RPM stage 4 rear. A year old and dont want to rebuild again. I know some people say royal purple for gear noise and some aims posi additive
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Old 07-30-2013, 05:57 PM   #4
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Gear lube isn't gonna do anything. I tried thicker lube once for a whining diff and it got louder if anything.
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Old 07-30-2013, 09:18 PM   #5
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Different or new gear lube will not correct or reduce gear noise. However the wrong lube can create it. A Corvette differential utilizes hypoid gearing meaning the pinion is offset from the centerline of the ring gear. This makes for a stronger gear-set but introduces a sliding component. As a result gear lubes used in hypoid gearing must contain an EP (extreme pressure) additive. Most commercial oils today do have the EP additive however if they don't the results are scoring and noise. When in doubt check.
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Old 07-30-2013, 09:20 PM   #6
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This is the appropriate fluid, but don't think any fluid will help the noise:
AMSOIL Severe Gear Extreme Pressure Synthetic 75w90 (Product Code SVGQT)

I had an 06 CTS-V for several years (sold it in 09) and that model had many TSBs on diff whine. Many Caddy Forum members tried heavier weight fluid (e.g. 75w110) but I never saw consensus that this really helped and the increased viscosity would result in a loss of net HP and a lowering of mpg.

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Old 08-01-2013, 11:23 AM   #7
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If lower noise is more important than losing a few hp then add some Lucas oil additive.
It's thick like honey and will absorb some of the noise.
You could also wrap some kind of insulation around the pumpkin and leave just 1 face for cooling if you're not beating on it all the time.

All together this may reduce your noise by half but won't eliminate it.
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Old 08-01-2013, 11:23 AM
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