FullBlown 8.8 FRS/BRZ Differntial - Page 2 - Lexus IS Forum
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post #16 of 23 (permalink) Old 04-16-2016, 05:31 PM
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Ring gear measures 8.8".
28 Spline axle shafts with a 1.29" diameter
31 Spline axle shafts with a 1.32" diameter
Ratios: 2.26, 2.47, 2.73, 3.08, 3.27, 3.31, 3.45, 3.55, 3.73, 4.10 & 4.56, 5.14
Was just looking at the exploder diff.



Looks closer to the IS than I expected.



Mock up behind a Miata,
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post #17 of 23 (permalink) Old 04-22-2016, 11:34 AM
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Originally Posted by Ek9B18 View Post
Was just looking at the exploder diff.



Looks closer to the IS than I expected.



Mock up behind a Miata,
You think the back cover from the full blown diff will bolt up to this one? That would be huge.

2002 IS300 1095rwhp Alpha Tuned

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post #18 of 23 (permalink) Old 04-22-2016, 12:38 PM
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You think the back cover from the full blown diff will bolt up to this one? That would be huge.
It looks pretty big. I'd call it GS400 sized.
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post #19 of 23 (permalink) Old 04-24-2016, 09:16 PM
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havent the stock is300 diff been proven to handle 1000hp. i know vitsbits did 1100 on stock diff but i think it finally gave out. Mo did over 1k hp on stock is300 diff and axles. you just need to install os giken diff in there and youll be set

01 DWP IS300 (diablofire old IS) currently project on hold for funds. Big future goals, but only if money stacks right.
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post #20 of 23 (permalink) Old 04-25-2016, 05:50 AM
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Originally Posted by aww-shiet View Post
havent the stock is300 diff been proven to handle 1000hp. i know vitsbits did 1100 on stock diff but i think it finally gave out. Mo did over 1k hp on stock is300 diff and axles. you just need to install os giken diff in there and youll be set
Im sure it would make it stronger but i want to be able to launch hard and also change my gearing down to at least 3.26. Its terrible with a v160 the way i have it now.
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post #21 of 23 (permalink) Old 04-25-2016, 09:12 AM
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Originally Posted by aww-shiet View Post
havent the stock is300 diff been proven to handle 1000hp. i know vitsbits did 1100 on stock diff but i think it finally gave out. Mo did over 1k hp on stock is300 diff and axles. you just need to install os giken diff in there and youll be set
Yeah, we kind of high jacked the thread for the gearing options.

Stock can definitely handle some serious power. Just limited on gearing.
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post #22 of 23 (permalink) Old 04-25-2016, 10:17 AM
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Originally Posted by blkdout View Post
Yeah, we kind of high jacked the thread for the gearing options.

Stock can definitely handle some serious power. Just limited on gearing.
happens everytime lmao. but at the end of the day i def want to look into this swap more. I heard the thunderbird 8.8 housing has been used in many platforms (s2000,miata etc)

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post #23 of 23 (permalink) Old 07-01-2018, 11:32 AM Thread Starter
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https://www.grannasracing.com/collec...or-lexus-is300



Bringing back old thread

Second company I found that makes an 8.8 swap and then some, which is a new build for the site. I check it periodically.

Here is the info from the site:
The Grannas Racing 8.8 Kit Includes:

Low Profile Cast aluminum rear diff cover
Fabricated rear cage mount
Fabricated front crossmember mount
All hardware required for installation
Customer will need to find a cobra / thunderbird / mark 8 diff at local junkyard, usually these go for $150-250. I can also build a diff to suit your needs.
Axles and driveshafts are normally a 2-4 week wait time. Aluminum or Carbon Fiber driveshafts can be made for any transmission combination. Just let me know what chassis and what transmission combo you are running in the order notes!

You can have a local shop mustang/domestic shop build your junkyard 8.8, or you can have me build you one to your specs. In the dropdown options, you can select a GR built rear which includes a Truetrac LSD, and gear ratio of your choice, and all new bearings and seals, it also includes me sourcing the differential case. For ring and pinion, in V160 cars I recommend a 3.25 gear, for the T56 Magnum / GR series transmissions I recommend 4.10 to 4.30 gearing. Please note there is a 3-4 week build time on the 8.8 rear ends.

Check out the pictures to see the stacking order for the front mount hardware.

VIDEO COMING SOON

Last edited by IS-2JZ; 07-01-2018 at 11:33 AM. Reason: picture did not work
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