Ring & Pinion Swap Stock Differential - Page 2 - Lexus IS Forum
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post #16 of 21 (permalink) Old 12-31-2018, 03:07 AM
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Originally Posted by Ek9B18 View Post
I did it. It's a pain in the ass. I'm running a 3.58 gear set now. I had to build special jigs and get a torsion type inch/lb torque wrench to measure pre-load.

It's worth paying someone else to do it. As long as they do it correctly.

https://www.driftmotion.com/DM-MK3-2...t-p/dm3462.htm

Is the kit I used. I got a solid pinion spacer too.
Give us some real-world data on the 3.58 swap, when you have time. I am toying with doing it to mine. Single turbo gte and AR5. Mileage improvement/longer gearing like it love it etc. what should we expect. I’m on 3.9 gears currently.

Thanks in advance!
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post #17 of 21 (permalink) Old 12-31-2018, 08:18 AM
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Sadly I probably won't be driving it again till spring. I was already at 3.73 so, you change would be bigger than mine.
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post #18 of 21 (permalink) Old 12-31-2018, 03:21 PM
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Well, is it worth the outlay of money?

250$ r&p
$250ish bearings, seals, etc
250$? Labor to assemble and set backlash

Will I notice much difference in your opinion?
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post #19 of 21 (permalink) Old 03-02-2019, 08:06 PM
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Originally Posted by Kris OK View Post
Well, is it worth the outlay of money?

250$ r&p
$250ish bearings, seals, etc
250$? Labor to assemble and set backlash

Will I notice much difference in your opinion?
It's a huge difference, completely changed the driving experience. With the CD009 and 3.90 rear the shifts were so short that it took the fun right out of driving. I think it added around 8 mph in sixth gear at 3000 rpm cruising. Money well spent IMO.
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post #20 of 21 (permalink) Old 03-02-2019, 10:27 PM
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Funny you posted this. I just took my Diff and new R&P to get the 3.58 swap done. I waited a month for new pinion bearings from Amayama Trading, but they finally did come through. I have an AR5, so I don’t think it is as short as a CD009 but doing the math, I’m looking at an 8-10mph difference in 5th between the 3.9 and 3.5. That is huge.

Hope to change out to poly bushings and get it stabbed back in next week. I’ll go easy on it before I flog it, but will update the thread when I do.
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post #21 of 21 (permalink) Old 03-10-2019, 07:08 AM
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Ok so just to update. I got my diff back with the 3.58 gearset. It was a new set (they didn’t have any used, and new was only 15$ more) from Nitro Gear, so I am breaking them in. Cruising speed is about 200-300 rpm lower, so that’s nice. It builds boost in 2nd a little better, too. I’ll flog on it more once it’s broken in. So far, I am happy with it.
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