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A simple way to a quieter diff. ........

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Old 04-17-2002, 04:20 PM   #1
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Default A simple way to a quieter diff. ........

For those of you who have a whine coming from your diff, (I'm not not talking about a chainsaw whine!) try putting in Redline shockproof heavy formulation gear oil . (70W250) I filled my diff with it today and 90% of the whine I had is gone. There is still a very slight whine at around 45 MPH but the whine from 60-70MPH is completely gone.
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1998 Z28 M6/LS6 383 CID Lunati stroker/PP Stage II+heads/ Comp Cams 242/242 .610/.610 113+4* lsa/ARP mains and head studs/ Yella Terra rockers/ LS6 intake/Kooks stainless1 7/8" headers/ 3"X3"ORP/ QTEC cutout/ LS6 PCV/Rollmaster double roller T-chain/Katech oil pump/Spec 3+ /3.73-12 bolt Strange/ASP pulley/ Magnaflow cat back/315 Nittos/K&N + MTI lid/160 Tstat/SLP rad .Other stuff.....
Old heads and cam: 11:47@123.5mph (4400rpm launch)
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Old 04-17-2002, 06:23 PM   #2
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Default Re: A simple way to a quieter diff. ........

Did you also add any GM limited slip to that?
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Old 04-17-2002, 07:10 PM   #3
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Default Re: A simple way to a quieter diff. ........

Does that stuff pour in or do you use a shovel? <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

I know a couple guys use the 85/140 and that seems to help too. Did you try that or go straight to the 250? Just wondering how big the difference is, if you know.
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Old 04-17-2002, 08:00 PM   #4
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Default Re: A simple way to a quieter diff. ........

I did some experimenting with diff oils in my Viper and had experience with this oil already.It is the quietest of all of them. I put in the Redline shockproof heavy in the Z when I changed to a T/A cover. Yes I added the additive.

<small>[ April 17, 2002, 08:06 PM: Message edited by: StevieZ ]</small>
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1998 Z28 M6/LS6 383 CID Lunati stroker/PP Stage II+heads/ Comp Cams 242/242 .610/.610 113+4* lsa/ARP mains and head studs/ Yella Terra rockers/ LS6 intake/Kooks stainless1 7/8" headers/ 3"X3"ORP/ QTEC cutout/ LS6 PCV/Rollmaster double roller T-chain/Katech oil pump/Spec 3+ /3.73-12 bolt Strange/ASP pulley/ Magnaflow cat back/315 Nittos/K&N + MTI lid/160 Tstat/SLP rad .Other stuff.....
Old heads and cam: 11:47@123.5mph (4400rpm launch)
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Old 04-17-2002, 09:31 PM   #5
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Default Re: A simple way to a quieter diff. ........

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Ragtop 99:
[QB]Does that stuff pour in or do you use a shovel? <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> QB]</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif"><img border="0" alt="[jester]" title="" src="graemlins/gr_jest.gif" /> <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
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Old 04-17-2002, 11:57 PM   #6
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Default Re: A simple way to a quieter diff. ........

I've put heavier diff oil in and the diff got real hot! I think it is due to more friction of heavy churning oil.

Leo
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Old 04-18-2002, 12:28 AM   #7
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Default Re: A simple way to a quieter diff. ........

Holy **** that's thick!! I think I will stick to 85w140 for now. Keep us posted on how the rear end acts with some miles on the clock with this oil/malasses...

Josh
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Old 04-18-2002, 05:58 AM   #8
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Default Re: A simple way to a quieter diff. ........

You won't see heat from the Redline shockproof. In fact they garantee you will see lower temperatures.
Here's a quote from their website......
" ShockProofTM Gear Oil has a 40% lower coefficient of friction and 250% the load-carrying capacity compared to conventional gear oils, which means that metal- to-metal friction is greatly reduced. Temperature reductions between 25F - 75F are common in circle track, road racing, and off-road racing. Improved durability in high-performance use is the primary benefit of the Heavy ShockProofTM and along with the improved durability is an improvement in efficiency, but if further improvements in efficiency are desired, and durability is not a major concern, LightWeight and SuperLight ShockProof TM can be used."
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1998 Z28 M6/LS6 383 CID Lunati stroker/PP Stage II+heads/ Comp Cams 242/242 .610/.610 113+4* lsa/ARP mains and head studs/ Yella Terra rockers/ LS6 intake/Kooks stainless1 7/8" headers/ 3"X3"ORP/ QTEC cutout/ LS6 PCV/Rollmaster double roller T-chain/Katech oil pump/Spec 3+ /3.73-12 bolt Strange/ASP pulley/ Magnaflow cat back/315 Nittos/K&N + MTI lid/160 Tstat/SLP rad .Other stuff.....
Old heads and cam: 11:47@123.5mph (4400rpm launch)
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Old 04-19-2002, 05:20 PM   #9
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Default Re: A simple way to a quieter diff. ........

if you want tom take it the whine out. get it reshimed. take out shiming and pull the gear back. it worked for me!! now my rearend is quite <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
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Old 04-19-2002, 05:20 PM
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