Dinan 4.10 LSD Gear Whine

Scharbag · 12-09-2017, 02:53 PM

Just wondering if there is anything that can be done about gear whine in a Dinan 4.10 LSD. It is apparent between 70 and 90 KPH when on light throttle. It is annoying.

I am also not a huge fan of the 4.10 gears and I may swap back to 3.85 if possible.

Please let me know if you have any ideas.

Cheers,

dparm · 12-09-2017, 03:27 PM

What does Dinan specify for fluid? A 75w140 with FM additive? Do they provide any guidance on how much of the additive you need?

Remember that the OEM LSD received complaints from early owners about being too noisy so BMW upped the dosage of friction modifier in the gear oil.

Dave07997S · 12-09-2017, 04:58 PM

Quote:

Originally Posted by Scharbag

Just wondering if there is anything that can be done about gear whine in a Dinan 4.10 LSD. It is apparent between 70 and 90 KPH when on light throttle. It is annoying.

I am also not a huge fan of the 4.10 gears and I may swap back to 3.85 if possible.

Please let me know if you have any ideas.

Cheers,

4.10 gears inherently have more noise than the 3.85:1, you may want to try a friction modifier see if that helps. Man I would love to switch out with you.

Dave

deansbimmer · 12-10-2017, 09:41 AM

I've not noticed any discernible difference in gear whine with any 4.10's I've heard. If the subframe had aftermarket bushings installed, that could transmit more noise than the stock rubber bushings. I don't see friction modifier doing anything for gear whine, only clutch chatter which is a different sound. Abnormally excessive gear whine may be an indicator that the lash was set too tight during assembly.

Scharbag · 12-10-2017, 01:09 PM

Quote:

Originally Posted by deansbimmer

I've not noticed any discernible difference in gear whine with any 4.10's I've heard. If the subframe had aftermarket bushings installed, that could transmit more noise than the stock rubber bushings. I don't see friction modifier doing anything for gear whine, only clutch chatter which is a different sound. Abnormally excessive gear whine may be an indicator that the lash was set too tight during assembly.

I agree the FM will not change this whine issue at all. I recently changed the diff fluid (just for maintenance reasons) from BMW unicorn tears to Redline 75W140 (not the 75W140NS version that comes in the same coloured bottles...) and no difference in sound.

I did talk to Dinan and they pretty much said to just deal with it... I have read on other posts that the Dinan 4.10 was loud. Might be why they do not even offer to sell them anymore.

I will talk to my mechanic buddy to see if he can check the gear lash for me this winter while my car is sleeping.

Or, possibly will trade diffs with someone!!

Cheers,

Dave

Dave07997S · 12-10-2017, 06:05 PM

Now that I remember, when I did the 4.10s in my E46 M3 I also had the shifter switched out which removed the rubber bushings. I got more whine from that than the gears. Put 20k miles on those gears with no issues.

Dave

bigjae1976 · 12-13-2017, 01:38 PM

Move Over

Move Over · 12-13-2017, 01:42 PM

Quote:

Originally Posted by bigjae1976

Move Over

Thanks Jae

I just installed a set of 3.91's with a new clutch lsd, and it screams like a freaking hyena. 10x worse than my 3.62's did.

Granted i have all solid bushings and no interior (e46), but it still should not sound the way it does. Pulled it out today and going back to the assembler.

bigjae1976 · 12-13-2017, 01:54 PM

Quote:

Originally Posted by Move Over

Thanks Jae

I just installed a set of 3.91's with a new clutch lsd, and it screams like a freaking hyena. 10x worse than my 3.62's did.

Granted i have all solid bushings and no interior (e46), but it still should not sound the way it does. Pulled it out today and going back to the assembler.

Move Over

...only because I care

ilikebmxbikes · 12-13-2017, 03:55 PM

Quote:

Originally Posted by Scharbag

Quote:

Originally Posted by deansbimmer

I've not noticed any discernible difference in gear whine with any 4.10's I've heard. If the subframe had aftermarket bushings installed, that could transmit more noise than the stock rubber bushings. I don't see friction modifier doing anything for gear whine, only clutch chatter which is a different sound. Abnormally excessive gear whine may be an indicator that the lash was set too tight during assembly.

I agree the FM will not change this whine issue at all. I recently changed the diff fluid (just for maintenance reasons) from BMW unicorn tears to Redline 75W140 (not the 75W140NS version that comes in the same coloured bottles...) and no difference in sound.

I did talk to Dinan and they pretty much said to just deal with it... I have read on other posts that the Dinan 4.10 was loud. Might be why they do not even offer to sell them anymore.

I will talk to my mechanic buddy to see if he can check the gear lash for me this winter while my car is sleeping.

Or, possibly will trade diffs with someone!!

Cheers,

Dave

If your serious about trading diffs, let me know. I will gladly mail you a 3.85 and some cash for your 4.10

ebisueight · 12-14-2017, 09:33 AM

I feel like I need a Dinan Diff!

oldmanstyle · 12-14-2017, 02:37 PM

could be the R&P install job

Scharbag · 12-18-2017, 08:30 PM

These diffs are very easy to remove. So happy I did not need $1M in special tools.

Yippee.

Move Over · 12-24-2017, 02:25 PM

Quote:

Originally Posted by Scharbag

These diffs are very easy to remove. So happy I did not need $1M in special tools.

Yippee.

Much easier than the e46 diff "shelf" removal. I'll take the e90 job all day long!

Move Over · 12-24-2017, 02:26 PM

Quote:

Originally Posted by oldmanstyle

could be the R&P install job

Very well could be. The first guy who assembled mine had the pinion .22mm too far into the ring. Screamed like crazy.

12-09-2017, 02:53 PM	#1
Scharbag Colonel 2795 Rep 2,188 Posts Drives: 2011 E92 M3 Join Date: Oct 2017 Location: Victoria iTrader: (0) Garage List 2011 BMW E92 M3 [0.00]	Dinan 4.10 LSD Gear Whine Just wondering if there is anything that can be done about gear whine in a Dinan 4.10 LSD. It is apparent between 70 and 90 KPH when on light throttle. It is annoying. I am also not a huge fan of the 4.10 gears and I may swap back to 3.85 if possible. Please let me know if you have any ideas. Cheers, __________________ 2011 E92 M3 - 6MT, ZCP, ZF LSD, ESS G1, Some other goodies...
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12-09-2017, 03:27 PM	#2
dparm Stop the hate, get a V8 3928 Rep 8,631 Posts Drives: C7 Corvette, Spec E46, G87 M2 Join Date: Jun 2013 Location: Frisco, TX iTrader: (1)	What does Dinan specify for fluid? A 75w140 with FM additive? Do they provide any guidance on how much of the additive you need? Remember that the OEM LSD received complaints from early owners about being too noisy so BMW upped the dosage of friction modifier in the gear oil. __________________ Now: 2017 Corvette Grand Sport, 2001 BMW Spec E46 race car, 2025 BMW M2 Past: 2011.5 M3 sedan ZCP
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12-10-2017, 09:41 AM	#4
deansbimmer BimmerPost Supporting Vendor 4324 Rep 3,023 Posts Drives: 2011 E93 M3 Join Date: Nov 2014 Location: DFW, Texas iTrader: (17) Garage List 1988 E30 M3 [0.00] 2006 E46 M3 [0.00] 2024 X7 M60i [0.00] 2011 BMW M3 [0.00]	I've not noticed any discernible difference in gear whine with any 4.10's I've heard. If the subframe had aftermarket bushings installed, that could transmit more noise than the stock rubber bushings. I don't see friction modifier doing anything for gear whine, only clutch chatter which is a different sound. Abnormally excessive gear whine may be an indicator that the lash was set too tight during assembly.
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12-10-2017, 06:05 PM	#6
Dave07997S Major General 2342 Rep 5,139 Posts Drives: 2024 BMW M2 Toronto Red 6MT Join Date: May 2009 Location: El Segundo, CA iTrader: (1)	Now that I remember, when I did the 4.10s in my E46 M3 I also had the shifter switched out which removed the rubber bushings. I got more whine from that than the gears. Put 20k miles on those gears with no issues. Dave __________________ 2024 BMW M2 Toronto Red 6MT (Sold) 2020 Ford Mustang GT 6MT PP1 444rwhp 2013 M3 Coupe-MR/BLK ZCP, 2011 M3 Coupe-MR/Blk 2007 Porsche 997C2S Speed Yellow/Blk sport seats 2004 BMW M3 Imola/Blk, 2001 BMW M3
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12-13-2017, 01:38 PM	#7
bigjae1976 Major General 2013 Rep 8,248 Posts Drives: 11 E90 M3 Individual Join Date: Mar 2006 Location: Houston, TX iTrader: (22) Garage List 2004 BMW M3 [6.33] 2011 BMW E90 M3 [6.83] 2013 BMW 328i [6.67]	Move Over __________________ 2018 F30 320iX Melbourne Red 2011 E90 M3 Monte Carlo Blue 2004 E46 M3 Imola Red 2000 E36/7 Z3 Steel Blue
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12-14-2017, 09:33 AM	#11
ebisueight Dom 1103 Rep 1,736 Posts Drives: M3 Join Date: Jan 2009 Location: Georgia iTrader: (79)	I feel like I need a Dinan Diff!
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12-14-2017, 02:37 PM	#12
oldmanstyle Second Lieutenant 106 Rep 265 Posts Drives: M3 Join Date: Feb 2010 Location: USA iTrader: (0)	could be the R&P install job
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12-18-2017, 08:30 PM	#13
Scharbag Colonel 2795 Rep 2,188 Posts Drives: 2011 E92 M3 Join Date: Oct 2017 Location: Victoria iTrader: (0) Garage List 2011 BMW E92 M3 [0.00]	These diffs are very easy to remove. So happy I did not need $1M in special tools. Yippee. __________________ 2011 E92 M3 - 6MT, ZCP, ZF LSD, ESS G1, Some other goodies...
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