Official OEM LSD thread: Case closed, important info inside - Lexus IS Forum
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post #1 of 256 (permalink) Old 02-01-2009, 08:11 PM Thread Starter
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Official OEM LSD thread: Case closed, important info inside

I think I found there may be a way to tell the difference between an open diff and an LSD diff without taking the rear cover off. Underneath the diff, when you jack up the car, there will be a sticker that says M96 or M85. So far only one other guy and myself have confirmed that our open diffs have M96 on them but we'll need some more people to inspect their cars to confirm the assumption. Where you are looking is right under the nose of the diff where the pinion goes in. Please post what your door number says (BO2A=Open, BO2B=LSD, BO2C=LSD) and what your diff says (M85 or M96), thanks!





Here is the information we gathered. Now if you have an open diff in your IS and want to install an OEM LSD differential, you know what to look for!

Quote:
Gathered information. (Confirmed)

1. M96 sticker equals open Diff.
(auto or manual)

2. M98 sticker equals Locking diff. (LSD)
(auto 3.9)

3. M85 sticker equals Locking diff. (LSD)
(manual 3.7)
Thanks to 2JZ-adm for working with me on this and everyone who contributed!

-Brian

01 MSM-IS350 wheels- S2000 antenna-Grom

Last edited by Brian7; 02-17-2009 at 12:37 PM.
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post #2 of 256 (permalink) Old 02-01-2009, 08:59 PM
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Your my hero!
When I take my diff back im gonna check out those numbers and
take a look this time in the drain cap.

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post #3 of 256 (permalink) Old 02-01-2009, 09:20 PM Thread Starter
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Quote:
Originally Posted by 2JZ-adm View Post
Your my hero!
When I take my diff back im gonna check out those numbers and
take a look this time in the drain cap.
One thing it *could* be a distinction between is gear ratios though so we'll need to know if the cars we are gathering information from are auto or manual. I think what I read in your thread was auto's have 3.73 gear ratios and manuals have 3.91's? Here is my information to get this rolling...

2001 Auto, BO2A on the VIN sticker, M96 on the diff

-Brian

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post #4 of 256 (permalink) Old 02-01-2009, 09:57 PM
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i saw one on the internet that had M98 on it.
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post #5 of 256 (permalink) Old 02-01-2009, 11:19 PM Thread Starter
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i saw one on the internet that had M98 on it.
Well that would throw a tree branch into the spokes of this idea.

-Brian

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post #6 of 256 (permalink) Old 02-02-2009, 01:00 AM
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Quote:
Originally Posted by Brian7 View Post
I think what I read in your thread was auto's have 3.73 gear ratios and manuals have 3.91's?
Its the other way around for the gear ratios.
Man I hop we get somewhere with this.

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post #7 of 256 (permalink) Old 02-02-2009, 01:03 AM
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Originally Posted by g55 View Post
i saw one on the internet that had M98 on it.
Well if our theory is correct and a m96 corresponds with
an open differential, then maybe the two options left
(m85 & m98) could be an auto diff and a manual diff.
This could go deeper than i thought.
On a mission to the junk yard on tuesday,
ill keep ya updated.

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post #8 of 256 (permalink) Old 02-02-2009, 03:53 PM
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FINALLY SOME PROGRESS! Went to the junk yard today
To take back the diff. I bought that was supposed
to be an lsd but ended up being an open.
Well after digging through six diffs. we found a diff
with a m85, low and behold a lsd. I will post pictures later
and count the teeth to see if its auto or manual.
Yaaaaay!

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post #9 of 256 (permalink) Old 02-02-2009, 03:56 PM
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Probly should have MODs move to 1st gen general discussion.

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post #10 of 256 (permalink) Old 02-02-2009, 04:48 PM Thread Starter
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Quote:
Originally Posted by 2JZ-adm View Post
FINALLY SOME PROGRESS! Went to the junk yard today
To take back the diff. I bought that was supposed
to be an lsd but ended up being an open.
Well after digging through six diffs. we found a diff
with a m85, low and behold a lsd. I will post pictures later
and count the teeth to see if its auto or manual.
Yaaaaay!
That is AWESOME!

-Brian

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post #11 of 256 (permalink) Old 02-02-2009, 07:31 PM
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post #12 of 256 (permalink) Old 02-02-2009, 10:22 PM
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Okay, I know i said I would post pictures and
I will, tomorrow.
Atleast we know that the stickers have somthing to do
with open or locking at this point.
Another thing to look for that wasnt posting in this thread;

https://my.is/forums/f88/pictures-my-...rriers-263213/

If you happen to go diff. hunting and your looking for that M85 sticker,
check any diffs. that may be missing a sticker
by looking through the output sides of the diff.
(if there isnt any output flange still connected to the diff.)
You can tell right away the difference between open and locking.
Will most definitely post a few pics tomorrow.

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post #13 of 256 (permalink) Old 02-02-2009, 11:54 PM
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has anyone driven on an stock auto non-LSD diff (or LSD diff i guess) and compared it to a stock manual LSD diff??
after boosting last summer with my auto tranny, the shortness of each gear became extremely noticeable and highly unpleasant to drive.

i was hoping that i could hold gears longer once i did my r154 swap but i don't really notice a difference (i guess it's because i now have 5 true gears as opposed to the 4 gears in the auto tranny (not counting 1st gear, which isn't really a gear obviously)).
i can't hold 1st or 2nd NEARLY long enough before my RPMs rise too much (it's not bad when driving aggressively, but since its my daily driver, i would say 80% of the time i'm trying to drive it normally, without going into boost. and the only way to stay out of boost is to shift through my gears WAYY more quickly than is comfortable).
once i'm in 3rd it doesn't bother me so much, but HOW THE HELL CAN I MAKE MY GEARS SIGNIFICANTLY LONGER??

(not sure how you say it. lower my gear ratios? make my gears longer? however you say it, i want to be able to hold each gear longer before feeling like i have to shift)

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post #14 of 256 (permalink) Old 02-03-2009, 06:59 AM
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Quote:
Originally Posted by LO 21 View Post
HOW THE HELL CAN I MAKE MY GEARS SIGNIFICANTLY LONGER??

(not sure how you say it. lower my gear ratios? make my gears longer? however you say it, i want to be able to hold each gear longer before feeling like i have to shift)
I dont know too much about gear ratios. The more gears you have the shorter theyre gonna be. I dont know how much more of difference between
changing the oem diff. for another oem. Then again, I dont really know.
You may wanna ask someone in the "Go faster" section, they probly would have more skill with that field, especially with you, being boosted and all.
Sorry, I couldnt help you more.
GL

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post #15 of 256 (permalink) Old 02-03-2009, 09:44 AM Thread Starter
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Quote:
Originally Posted by LO 21 View Post
has anyone driven on an stock auto non-LSD diff (or LSD diff i guess) and compared it to a stock manual LSD diff??
after boosting last summer with my auto tranny, the shortness of each gear became extremely noticeable and highly unpleasant to drive.

i was hoping that i could hold gears longer once i did my r154 swap but i don't really notice a difference (i guess it's because i now have 5 true gears as opposed to the 4 gears in the auto tranny (not counting 1st gear, which isn't really a gear obviously)).
i can't hold 1st or 2nd NEARLY long enough before my RPMs rise too much (it's not bad when driving aggressively, but since its my daily driver, i would say 80% of the time i'm trying to drive it normally, without going into boost. and the only way to stay out of boost is to shift through my gears WAYY more quickly than is comfortable).
once i'm in 3rd it doesn't bother me so much, but HOW THE HELL CAN I MAKE MY GEARS SIGNIFICANTLY LONGER??

(not sure how you say it. lower my gear ratios? make my gears longer? however you say it, i want to be able to hold each gear longer before feeling like i have to shift)
Getting a "higher" (numerically lower) rear end ratio will let you hold the gears for a little longer but your launches will suffer. Making the rear gear ratio "higher" will also lower your RPM's on the freeway at cruising speed. It's like you can have one but not the other when it comes to gears; slower launch but longer gears, faster launch but shorter gears. I guess since your car is boosted, you could benefit greatly from "higher" rear end gears. I would contact a rear end shop in your area and find out who, if anyone, makes aftermarket ring and pinions for our cars in different ratios than stock. Again, you are probably looking at going to a numerically lower rear end ratio.

-Brian

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