duckJAI

Ok, I searched and have found 3 numbers.

3.92 being the most common but I actually read in a few threads 4.27!?!?

It does not make sense that within 2years, Lexus changes the final drive from 3.92 to 4.27.

Also, 1GS3 has a final drive of 4.08.

So here are all the final drive #s I've found.

3.26 GS4
3.76 Supra TT auto
3.92 2GS3
4.08 1GS3
4.27 2GS3 (00-05) *not sure if this is right*

So, looking at this Lexus/Toyota has made at LEAST 4 different final drives but the pumpkins are pretty much all interchangable????

Looking at putting a 1GS3 diff into my 2GS3 (00') which seems to have different final drives, but researching threads show that at least the pumpkin is a bolt on affair since 1GS3 owners bolt up the Supra TT auto diffs no problem.

So 3.92, 4.08 or 4.27 for a 00' GS3?

I'm very lost here....need some solid info!

Thanks again CL!

Spyder78

iTrader: (7)

All 2nd gen GS300 diffs were 3.92. Gs400 and GS430 were 3.26.

aristo2369

iTrader: (2)

I have a 4.27 of my Kazz lsd... lots of power 1-2-3 gear but 4 gear just dont pull anymore.....

GS FONZy

iTrader: (6)

Why do you want to swap?

duckJAI

How do you have a 4.27? Which year is that?

duckJAI

I want to swap because EpiK has a 2way Kaaz LSD in his 93 GS300 rear diff.

kit cat

iTrader: (6)

Wasn't it 3.23 on the GS4x0?

I have 3.76 and Torsen LSD from a JZA80 but I cannot imagine going 4.xx. I'd be sure to have some sort of LSD (not open diff) if you go anything more than a 3.76 or you're just gonna be doing a one tire burn out all day.

duckJAI

What's so bad about 4.xx?

Is it because that would mean a lot more faster acceleration, also bad gas mileage as well?

duckJAI

Also, here is one of the links where it states 2000-2005 GS300 with 4.27 Final Drive.

Seems like a member who's been on CL for a bit, obviously not sure if the info is correct or not.

https://www.clublexus.com/forums/gs-...fit-98-gs.html

kit cat

iTrader: (6)

1. I'm at 3000rpm@80mph with a 3.76 final. And V8s are thirsty engines inherently.
2. If you don't have a LSD of some sort, you're probably just going to spin one tire.
3. I think someone mentioned how the VSS acts up.

GS FONZy

iTrader: (6)

Dude, read!
The 4.27 came on manual SC', I doubt it was available on any GS'. 1gen GS most likely only had the 4.08, since that's what auto SC3's have.
Etherway, you can swap just the LSD unit, so you can still keep the same final gear ratio. Jeff swapped a 3.92 into a 400 and he said he like the way the car responded. I talked to him about it and he said he did not have any issues.

duckJAI

Reason why I just want to grab Epik's diff is to save on downtime and putting in an LSD. Especially if it needed shimming and etc, as well my diff is beginning to hum. I'm not sure if the final drive is damaged or if it's just the guts.

3.92 to 4.08 wouldn't be a noticeable difference I'm assuming. That would be 100rpm difference or even less in terms of cruising (just guestimating).

aristo2369

iTrader: (2)

I have 98 GS400 but with a Kazz aftermaket LSD....