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Cusco Rear diff install

Old Mar 2, 2016, 01:11 PM
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Originally Posted by sammyrex View Post
Where can you buy the side bearing? I have looked into many difference sources, just can not find them. Anyone knows? I am planning on replacing my rear diff with Cusco RS 1.5 way. Thanks for your input.
HA! Me too. My idiot local dealer just told me that I'd have to order the entire rear diff.
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Old Mar 3, 2016, 12:32 AM
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MB393957

It could be because they dont have the complete catalog. I was looking through the USDM catalog and it's missing a couple pages. Then I went looking through the JDM catalog and found it. Also has different size shims too.
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Old Mar 4, 2016, 09:46 AM
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Yeah, it looks like the US catalog is missing it. Weird.

Here's a diagram with part numbers:
http://www.partsbase.org/mitsubishi/...ferential-p-4/
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Old Jul 19, 2018, 06:33 PM
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Allow me to chime in with a chart.



It looks like to install the Cusco 1.5-way rear LSD, we need the AYC-compatible LSD itself (p/n LSD 452 L15) and two side bearings (p/n MB393957). Let me know if this is correct.

I also wonder what is the most ideal setup for autocross. Keep the stock front open diff (risk of diff failure because it's weak)? Use a Cusco 1.5-way front LSD too (p/n LSD 454 C15 or LSD 453 C15)? Or some other choices like the recently popular Wavetrac ATB front LSD?
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Old Jul 20, 2018, 08:04 AM
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Originally Posted by EvoTurboTurk View Post
Could you fit this on a evo 7 rear diff with ayc? does it require other parts like bearings etc?
You need CUS LSD 448 L15. I actually have an extra, if you are interested. It has brand new bearings installed.
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Old Jul 20, 2018, 03:54 PM
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Any info on how Evo performs the best? Open diff front and rear, LSD rear, or LSD front and rear?
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Old Jul 20, 2018, 03:59 PM
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Originally Posted by Lightsaber View Post
Any info on how Evo performs the best? Open diff front and rear, LSD rear, or LSD front and rear?
General consensus I'm getting is a clutch-type LSD in the rear with something like Wavetrac or Quaife up front. Open diffs are never good. Ever.
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Old Jul 20, 2018, 04:12 PM
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Originally Posted by kaj View Post
General consensus I'm getting is a clutch-type LSD in the rear with something like Wavetrac or Quaife up front. Open diffs are never good. Ever.
So you mean something like Quaife or Wavetrac LSD front and Cusco Type-RS 1.5-way LSD rear produces the best performance? I guess that makes sense.

I also heard that Quaife and Wavetrac front LSDs are much stronger than the stock front diff, which is prone to blow up when autocrossing. Not sure if the Quaife and Wavetrac front diffs are truly much stronger though.
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Old Jul 20, 2018, 06:11 PM
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Yeah, That is an example. So I'm told, though. Someone always hah an opposite point of view though LOL.
Wavetrac and Quaife are stronger but I've never heard of an OEM front diff grenading. Maybe I just haven't been around when they do.
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Old Oct 10, 2018, 01:23 PM
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Originally Posted by Segfault View Post
So thanks to Mert at GST, I got my Cusco RS 1.5way rear diff installed.

Attachment 315151

So like any diff install, you gotta get those half-shafts and drive shaft out of the way first. Disconnect the AYC lines, 3 bolts, and the diff comes right out. After that, you unbolt the side of the pumpkin that houses the rear diff.

Attachment 315152

Then you just slide the old diff off, unbolt the main gear around it, and transfer that gear to your cusco diff.

Attachment 315153

You can attempt to transfer the old side bearings too (the ring of bearings on the top of pic 2), but that's definitely not something for the timid. It's better and safer just to buy new ones.

After that, you just bolt everything back together and put the housing back in place. Put new SVG fluid in the diff part, ATF SPIII in the AYC part, and then bleed the lines. Thankfully, I was able to use the new application from Tephra to do that part.
What is the part # for the side bearings?

never mind, i see it's covered here: MB393957 (same for 8s, 9s, 10s)

What is MB393956, the differential pinion bearing? do I need one of those to install a new diff also?

Last edited by kyoo; Oct 10, 2018 at 01:40 PM.
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