3.92 LSD diff SWAP IN Gs400 - Club Lexus Forums


3.92 LSD diff SWAP IN Gs400

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Old 09-27-07, 01:17 AM   #1
TonY_G
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Smile 3.92 LSD diff SWAP IN Gs400

does anyone know about the 3.92 gearing with lsd from an 02 is300.... i'm wondering if this till fits with our cars? if not then i'll get the 3.76..

as you all know, the 3.76 unit is becoming very hard to find,
i have read all about the 3.92 vs. 4.27 vs 3.76

just want a 100% answer b4 i pull the trigger.

i have located a 3.76 unit but its very pricey vs the is300 LSD unit

also, the 3.92 is suppose to be even faster, plus on 20x10 rears 275/30/20
so im sure i'll be fine

so my question is, will it bolt up 100%? does it matter from Gs3 or is3? i know they have exact same gearing, but the 02+ came with LSD where as the Gs3 did not, i believe..

can some1 shed some light into this,
thank you
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Old 09-27-07, 01:29 AM   #2
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Also, i have located a MT, 3.727 LSD locking RATIO diff from 03 is300

3.72 and 3.76 are very close, so im sure its almost the same,

So will it bolt up 100%?
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Old 09-28-07, 07:55 PM   #3
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Sorry man, I only know about the 3.92 diffs from the auto GS3s.
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Old 09-28-07, 07:59 PM   #4
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ya i know that fits, and i see your sig.

how u liking the 3.92? would u recommend 4 some1 on 20's?

so if the 3.92 from gs3 fits gs4/430's, than shouldn't the is300 diff lets say from 02+ fit as well?

same motor, same tranny, same diff? hmm

anybody can comment on this?
thanx
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Old 09-28-07, 08:44 PM   #5
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I would think that it would work since it's mostly the same. I like the gears very much so and I have 19's.
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Old 09-28-07, 10:43 PM   #6
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look on the TRD site, but i think they are the same.
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Old 09-29-07, 12:19 AM   #7
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if you do lots of freeway driving i would go with 3.76. the 3.67 already kills lots of gas if you drove over 65mph.. i cant imagine the 3.92
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Old 09-29-07, 05:50 AM   #8
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well, its either or, cause 3.76 units are getting pretty old, and every1 still wants top dollar for them, Like i can't justify paying over $1000 for a unit thats 10-14yrs old plus shipping etc.

i can located a 3.92 diff cheap, but again it has no lsd, i have to do the TRD unit, which at the end costs about the same, give or take,

so i duno what to do,

i have priced 02+ is300 diffs with LSD for a pretty good price, but i would hate to buy it and for it not to fit or some problems occur, i just want straight bolt up, no problems...
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Old 10-02-07, 09:18 PM   #9
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So no body can answer this question?

Does Is300 diff fit in a g400/430's or not?
If Gs300 does, shouldn't is300?
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Old 10-02-07, 09:22 PM   #10
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3.92 is fine with 20s.
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Old 10-03-07, 07:31 AM   #11
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Quote:
Originally Posted by TonY_G View Post
So no body can answer this question?

Does Is300 diff fit in a g400/430's or not?
If Gs300 does, shouldn't is300?
Having owned both a GS and IS300, I can attest that the rear diff. between the two cars are different due to the design of the rear subframe. If it would've fit, I would've slap my IS diff. with LSD onto the GS already..
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Old 10-03-07, 09:55 AM   #12
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The 3.76 LSD I just got from Carson was new from Japan. Had the Japan Airlines Shipping Label on the box. I don't think the IS300 LSD is a bolt up and even if it was it may not be up to the task of pushing a heavier more powerful car. The conversion of a non-LSD to LSD is very costly in terms of labor, and the LSD unit isnt cheap. Labor to install the 3.76 LSD was $350.
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Old 10-03-07, 01:36 PM   #13
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There are 2 different discussions here.

First would be a differential and housing assembly. This is what is typically considered and in the case of the Supra assembly a direct bolt in on a GS.

Second would be the carrier only. A carrier is what the ring gear and differential gears bolt to. The carrier is then installed into the differential housing which also holds the pinion gear.

It is possible that an IS carrier would bolt into a GS or Supra housing. From what has been said above an IS housing will not bolt into the GS.

It would be valuable to find out if the IS carrier could be installed in a GS housing as that would give options. Of course the TRD carrier could also be used.

LSD carriers generally have either clutch activation or gear activation. The torsen style carriers are the gear type. The TRD is a clutch type. Each has plusses and minuses.
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Old 10-11-10, 02:05 PM   #14
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Does anyone know if the is300 LSD carrier will fit in a gs300 rear diff?
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Old 05-04-14, 08:36 PM   #15
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Quote:
Originally Posted by 98Gs4001UZ View Post
Does anyone know if the is300 LSD carrier will fit in a gs300 rear diff?
this. this. this.
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392, bushings, diff, differential, differnetial, fit, gabby, gear, gs400, hendrick, install, is300, isf, lsd, torsen

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