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Rear Diff clutch plates installed incorrectly from factory

Old Jun 24, 2011, 12:14 AM
  #31  
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I definitely need to do this. My buddy just did his recently and has confirmed that he does get a clunking noise etc while driving, and or turning.

Aaron
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Old Jun 24, 2011, 07:27 AM
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Can someone make a video of the clunking noise?
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Old Jun 24, 2011, 08:00 AM
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I describe mine as a faint chatter, it's not loud by any means.
A buddy gave me a 4oz bottle of Amsoil Slip Lock additive.
He said it should eliminate the noise. He said the Ford LSD additive (4oz. bottle) works as well.
I'll be adding it after work today, so we'll see.
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Old Jun 24, 2011, 08:36 AM
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Great write up for a DIYers. I decided to send mine to TRE because I wanted the whole diff looked at and I personal don't have the knowledge of how to re-shim my diff; We all know Mitsubishi didn't set them up right from the factory, at least not for high torque applications. I'm glad I had TRE look at it because I had cracks in one of the spider gears and the front pinion and side cover bearing went bad. I would have never knew I did until Jon showed me.

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Old Jun 24, 2011, 12:12 PM
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I have been wanting to do this for a bit now. just a bit apprehensive as i have never taken a diff apart.
guess you gotta learn somehow!
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Old Jun 24, 2011, 12:23 PM
  #36  
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Originally Posted by luckybull View Post
I have been wanting to do this for a bit now. just a bit apprehensive as i have never taken a diff apart.
guess you gotta learn somehow!
While I never had my Evo differential apart, I've done a couple of other cars and I did them both lying on my back with the diff housing still on car. When assembling it doing it that way, you hold everything in place with one had while inserting shims and bolts with the other. Slip and you've got the works on your face. So, doing it on a work bench should be a piece of cake.
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Old Jun 24, 2011, 12:33 PM
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Originally Posted by WeirPerformance View Post
I am glad to see that this info has finally been posted on the forums. The LSD itself was not set up incorrectly from the factory, it was done this way on purpose. As EVO8emUp said above the clutches were arranged this way to eliminate any clutch chatter (noise) from the LSD. It would cost Mitsubishi a fortune in warranty repairs for customers who complain about differential noise. Also, this is not done only by Mitsubishi, other OEMs do the same thing to reduce the noise from clutch type LSD units. This is a big reason a lot of OEMs have gone to Torsen style LSD units in IRS applications, which are nearly silent.
^+1

Ford lost a ton fixing this very issue on Explorers and even on the Mustang, crazy how people would complain about their limited slip diff actually working!

Had to re-shim the clutchpacks for looser clearance and "restack" them: plate-plate-plate-steel-steel-steel...made me sad having to do that to so many vehicles.

Guess I'll open mine up and change it!
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Old Jun 24, 2011, 12:38 PM
  #38  
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Originally Posted by luckybull View Post
I have been wanting to do this for a bit now. just a bit apprehensive as i have never taken a diff apart.
guess you gotta learn somehow!
Just ask and I can provide tips and tricks to certain steps.
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Old Jun 24, 2011, 12:46 PM
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Does this effect all USDM Evos 03-06??
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Old Jun 24, 2011, 12:51 PM
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It sounds like it. I don't think any US Evos make clunking noises while turning, stock.
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Old Jun 24, 2011, 01:12 PM
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I dont know about fixing the stock 8 plate, but my 12 plate is quite chattery with redline 75w-140NS. During the winter Ill use factory diaqueen as Ive heard that pretty much shuts them up.
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Old Jun 24, 2011, 01:36 PM
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Old Jun 24, 2011, 03:48 PM
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i will be very interested to see how this is performing as i've been eyeing the TRE diff down at the shop.
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Old Jun 24, 2011, 03:50 PM
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I read on the forum somewhere, that someone had the shep diff. He complained of chattering noises and shep recommend him do some figure 8s.
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Old Jun 24, 2011, 04:53 PM
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Originally Posted by bambooi View Post
I read on the forum somewhere, that someone had the shep diff. He complained of chattering noises and shep recommend him do some figure 8s.
That slips the clutches and will allow them to get some oil in there, reducing some of the chatter. A diff additive would help as well. (friction modifier)
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