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TRD front and center diffs

PostPosted: Mon Nov 12, 2012 6:19 am
by BADNEWS
ok so I've been doing some research and have came to the conclusion that Kaaz made the front/center lsd's for TRD. Here is some pictures of the TRD diffs taken apart:

Center lsd on the right. Center Viscous Coupling unit (aka vc) replaced with clutch pack front lsd on the left:
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front diff looking at where the shafts that connect everything. Outer/Biggest diameter shaft transfers power from the center diff to the rear diff via transfer gears. The middle shaft takes power from the center diff lsd to the front diff lsd. And the inner/smallest shaft gives power out to the front left wheel from the front lsd:
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vc carrier which is now the front diff carrier apart showing front diff housing:
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front diff housing opened up showing discs and 4 spider, lower left in 2nd pic and middle of 3rd:
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center diff opened up showing discs:
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4 spider center diff:
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Everything laid out. You can see there is like a bearing for the spider gears of the center diff to rotate, on the right shaft of the 3 in the first picture
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So as you can see you would never be able to buy just a front or center lsd from TRD. They were all sold as one unit part#41035-ST010 for a price of 370,000 yen. Which would equal $4,655 right now. And this has been discontinued for years so the price may of even been higher now if it was still available.

Now look at these discs from the trd lsd's:
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this was from a honda guy comparing lsd's.
Kaaz disc on the left next to a Os Giken disc on the right
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So I think Kaaz was the developer and producer of the TRD GT-4 front and center LSD's

Re: TRD front and center diffs

PostPosted: Mon Nov 12, 2012 6:29 am
by underscore
Have you tried to contact Kaaz to see if any of this is true?

Re: TRD front and center diffs

PostPosted: Mon Nov 12, 2012 6:50 am
by BADNEWS
underscore wrote:Have you tried to contact Kaaz to see if any of this is true?


No, just research it now and shared it with you guys.

Re: TRD front and center diffs

PostPosted: Mon Nov 12, 2012 1:38 pm
by BADNEWS
You can see the parts look identical here too. This is a pic showing all the pieces of a kaaz
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You can see the cusco plate grooves are on a different angle.
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here is from a Corolla AE86. left is stock, middle is TRD/Kaaz, right is Cusco:
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full write up here:
http://orangeadvan.blogspot.com/2008/07/stuck-on-lsd.html

another cusco disc pic:
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MAXGRIP by Weir Performance
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Re: TRD front and center diffs

PostPosted: Mon Nov 12, 2012 5:12 pm
by athousandleaves
Not sure if any of you guys saw/remember this but that white Alltrac that showed up on eBay a while ago with the owner claiming it was a race car made by Toyota with upgraded diffs was covered with Kaaz decals. I think I tried researching if they had ever made anything fo our car and found they hadn't so I assumed he wasn't correct in his assumptions about the diffs.
Looks like it may hve had the TRD/Kaaz upgraded diffs after all.

Re: TRD front and center diffs

PostPosted: Mon Nov 12, 2012 8:00 pm
by yota 3.0
wow great info and research man! its too bad all of this is so rare.


James

Re: TRD front and center diffs

PostPosted: Mon Nov 12, 2012 8:30 pm
by CMS-GT4
That thing is a work of art. Shame I did not think to buy it when I got my car.

Re: TRD front and center diffs

PostPosted: Mon Nov 12, 2012 8:52 pm
by athousandleaves
Can anyone recall what killed that TRD diff pictured above?
I feel like it was in a Russian car that got in a fight with a tow truck?

Re: TRD front and center diffs

PostPosted: Mon Nov 12, 2012 9:30 pm
by aus jd 2703
least that diff shows how its done now we just need some one to re-manufacture it....

Re: TRD front and center diffs

PostPosted: Mon Nov 12, 2012 9:44 pm
by BADNEWS
aus jd 2703 wrote:least that diff shows how its done now we just need some one to re-manufacture it....


Goodluck. That is 2 diffs, One that needs 2 housings made for it (Front diff), and custom shafts made to transfer the power back and forth. To do something like this is a ton of money! I'm having a hard time generating interest for a front and center diff combo where the guy thinks he can do it for a far more reasonable price. I talked to him today to see if it is possible for just a front diff since it doesn't seem like people want the center upgraded. He is looking into our options.

Personally I have been looking into what EVO's are doing. They do a Helical (Quaife style) Front LSD that is in the transfer case. Just like how the TRD one is. Then a Helical (Quaife style) Center LSD which is in the main transmission. And run a clutch type Rear LSD.

So if we can get people on board for this, I can see what he thinks it'll cost. Should I even ask? I can tell you it'll be big $$$ but Pat (Alltrac101) and I are already in. We need like 2 or 3 more guys to make this happen.

Re: TRD front and center diffs

PostPosted: Mon Nov 12, 2012 9:51 pm
by klue
clutches take up to much space IMO leading to smaller, weaker sub components. I want some big as gears in there that go HIYAH when the kick in

Re: TRD front and center diffs

PostPosted: Mon Nov 12, 2012 10:53 pm
by CMS-GT4
For as expensive this is all getting, I still wonder the cost in adapting an evo gearbox and rear dif.

Re: TRD front and center diffs

PostPosted: Mon Nov 12, 2012 11:26 pm
by athousandleaves
CMS-GT4 wrote:For as expensive this is all getting, I still wonder the cost in adapting an evo gearbox and rear dif.


+1


Didn't the evos and ST205's both use the XTrac 532 6-Speed gearbox for rallye anyway? Are we the same bellhousing pattern?

And yeah, my car could do with a good ol' HIYAH!

Re: TRD front and center diffs

PostPosted: Mon Nov 12, 2012 11:46 pm
by BADNEWS
CMS-GT4 wrote:For as expensive this is all getting, I still wonder the cost in adapting an evo gearbox and rear dif.


I doubt that would be cheaper. Plus all the upgrades it needs to handle the power.

Re: TRD front and center diffs

PostPosted: Tue Nov 13, 2012 12:03 am
by CMS-GT4
athousandleaves wrote:
CMS-GT4 wrote:For as expensive this is all getting, I still wonder the cost in adapting an evo gearbox and rear dif.


+1


Didn't the evos and ST205's both use the XTrac 532 6-Speed gearbox for rallye anyway? Are we the same bellhousing pattern?

And yeah, my car could do with a good ol' HIYAH!


Needs an adapter plate I think, and possibly a custom clutch. Then there is the needed mounts and axle adapting. Plus, if I was to ever do this, I would upgrade the front system to handle the power. There are some places online that offer the parts. I think it would be in the 7k range to do.