Ring & Pinion Swap Stock Differential - Lexus IS Forum
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post #1 of 21 (permalink) Old 02-23-2011, 05:12 AM Thread Starter
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Ring & Pinion Swap Stock Differential

So I need a longer final drive and I cannot afford nor want to deal with the difficulties of swapping the Supra/GS430 rear end into my IS300. I've read the thread about swapping the MKIII ring & pinion and it doesn't seem too hard at all.

Has anyone been able to fit a 3.54 ring & pinion into the stock IS300 rear end? It is the tallest one available for the Toyota 8" rear end so I'm guessing it would fit. Anything bigger and it probably wouldn't physically fit in the pumpkin.

So does anyone know if this ring & pinion would work?

Application Guide for Toyota Truck Ring/Pinion Sets and Positractions - Drivetrain.com

If I can get confirmation I'm going to order it ASAP. Any input would be greatly appreciated.

Aristo GTE/V161
6766 & MS3Pro
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post #2 of 21 (permalink) Old 02-23-2011, 08:45 AM
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If you're already boosted just leave what you have in there IMO... What trim waas your car originally? 5spd or auto?
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post #3 of 21 (permalink) Old 02-23-2011, 11:37 AM Thread Starter
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Quote:
Originally Posted by 04 ricer View Post
If you're already boosted just leave what you have in there IMO... What trim waas your car originally? 5spd or auto?
Because having to shift into 5th in the 1/4 mile is a waste of time.

It was originally a 5-speed, the v161 + stock 3.72 rear end = annoyingly short gears for boost...

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post #4 of 21 (permalink) Old 02-23-2011, 12:09 PM
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You can always build your head and raise the rpms up so that you don't have to shift...? If I had a v161 I'd run my 3.9 rearend and have my top end built for high rev...
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post #5 of 21 (permalink) Old 02-23-2011, 12:14 PM Thread Starter
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Quote:
Originally Posted by 04 ricer View Post
You can always build your head and raise the rpms up so that you don't have to shift...? If I had a v161 I'd run my 3.9 rearend and have my top end built for high rev...
It would still be too short with a 3.9 rear end. In 6th at 80mph with a v161 and 3.9 rear end you will be at like 3600-3800 rpm haha.

I'm trying to get my rev limit issue sorted out, I think with a 7400 rpm rev limit with the 3.54 ring and pinion the car will be perfect.

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post #6 of 21 (permalink) Old 02-23-2011, 04:21 PM
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Lemme help with a visual aid.

A 3.54 might be ideal. But outside of that, you could also try running a larger diameter tire size in combination with that 7400 rpm rev limitor.

This should put you right at ~124 mph when you run out of gear. What are you trapping currently?
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post #7 of 21 (permalink) Old 02-25-2011, 07:02 PM
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I currently have a MK3 clutch style LSD. I will let you know in the next week or so how the procedure goes.
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post #8 of 21 (permalink) Old 02-25-2011, 08:21 PM Thread Starter
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Quote:
Originally Posted by TeCKis300 View Post
Lemme help with a visual aid.

A 3.54 might be ideal. But outside of that, you could also try running a larger diameter tire size in combination with that 7400 rpm rev limitor.

This should put you right at ~124 mph when you run out of gear. What are you trapping currently?
I'm trapping at 122ish right now, give or take 2mph, so I'm right at the top of 5th gear...

I think the 3.54 + 7400rpm rev limit will be perfect! But I need to know if the 3.54 gear will work from the site I posted. Or where I could get one that will work. Jawsgear no longer makes them.

Also did you get my PM TeckIS about the rev limit issue? Your help would be greatly appreciated!

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post #9 of 21 (permalink) Old 08-09-2011, 08:07 PM
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Hey did you get this to work buddy?

-------------------------------------------------------------------------------------------------
Fully Built 2JZGTE VVTI , HEADGAMES Ferrea Head, FOUR RINGS Perf. Block, IP Cstm Pistons/Manley TurboTuff/Calico/ARP
Precision 6766HP CEA, 272 VVTI Cams, STG3 V160, Clutchmster Twin, ETS Twin Scroll, Tial, GS400 Rear, TRD LSD, Supra Axles,
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post #10 of 21 (permalink) Old 08-10-2011, 08:51 AM
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I feel like this is possible. Also look at what I found:

41201-29547 --> EXPENSIVE but its 3.42!

41201-39795 - 3.583:1
41201-29547 - 3.42:1

-------------------------------------------------------------------------------------------------
Fully Built 2JZGTE VVTI , HEADGAMES Ferrea Head, FOUR RINGS Perf. Block, IP Cstm Pistons/Manley TurboTuff/Calico/ARP
Precision 6766HP CEA, 272 VVTI Cams, STG3 V160, Clutchmster Twin, ETS Twin Scroll, Tial, GS400 Rear, TRD LSD, Supra Axles,
Stoptech 4Whl BBK, Full Figs Suspension, KW V3, ProEFI 128, ID2000, Squash DBL Pumpr, Dual Tanabe Exhst
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post #11 of 21 (permalink) Old 08-12-2011, 10:12 PM
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Bump for updates lol

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post #12 of 21 (permalink) Old 08-13-2011, 04:42 AM
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Quote:
Originally Posted by Yogujuhere View Post
I feel like this is possible. Also look at what I found:

41201-29547 --> EXPENSIVE but its 3.42!

41201-39795 - 3.583:1
41201-29547 - 3.42:1
What did you find? Application?


ProPilot: Might check my thread in gofast.
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post #13 of 21 (permalink) Old 08-13-2011, 05:02 AM
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Quote:
Originally Posted by Brad Bedell View Post
What did you find? Application?


ProPilot: Might check my thread in gofast.
Link?

NEVER SELLING: 97 Supra TT/6spd/S366/10.5:1/FIC2150s/Walbro 416s/CORN FED - 808rwhp!!!! More to come!
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post #14 of 21 (permalink) Old 12-30-2018, 01:47 PM
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any updates? i found a 3.58 rear gear from https://www.justdifferentials.com/To...-358-29-ng.htm
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post #15 of 21 (permalink) Old 12-30-2018, 08:28 PM
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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.
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