LSD Diff options on a LS400

[hypronet]

hi guys,

from my understanding, lsd was a very limited option on the early ls400's.

i had done a lot of running around an reading to work out how to move away from the single legger std diff to a lsd or locker?

you can not swap the guts around, as a ls400 diff is a 8 3/4" diff where the supra is a 8" diff, not sure if the GS center will work, didnt look at those diffs?

the only options i had then was
1 install a supra diff
2 custom KAAZ diff center

i was able to pick up a 97 torsen supra diff very cheap ( i have friend that import wreaked jap cars), about half price to what a kaaz diff center would off costed, so i went that way.

being a fitter/welder, no problem with installation an fab work

KAAZ diffs are available for FWD, RWD and 4WD vehicles and are available in three versions - 1 Way, 1.5 Way & 2 Way.

• 1 Way is effective under acceleration only
• 1.5 Way is effective on acceleration and semi-locking on deceleration giving precise vehicle control
• 2 Way is effective on acceleration and deceeleration producing more understeer making it suitable for drifting and high speed road use.

here is the website for there location in the US
http://www.kaazusa.com/home/Home.htm

____________________________________________
http://www.lextreme.com/forums/showthread.php?t=9037
:sgrin:There is No substitute for cubic inch, except for BOOST !!!!:sgrin::burnout:
"91 LS400" Argo rods, CP pistons 9:1, Custom Tighte Cams, Whipple supercharger 20psi, Torsen Lsd,
Dual TB's, Whiteline swapbars, 97 RZ Supra brakes, Airbag & controller

 

[hypronet]

i c that gremlins r at it again?
pics where not posted by me?

 

[fastegg]

Torsen unit...

G'day mr hypronet... i have a 1998 LS400 and i'm getting closer to installing a Torsen center.
Q1: Do you know if a Torsen 1 is the same fitment as a Torsen 2 ?
Q2: Do you know what 'way' Supra Torsens are.. i mean 1, 1.5 or 2 way ?
Q3: Can i assume that the UCF21 diff is an 8:3/4" ?
Q4: Are all Torsen 2's the same size regardless of age ?
I believe the UCF10 and UCF20 diff centers are different.
Q5: Could i then assume that a 1998 and onwards Supra Torsen would fit a 1998 LS400 ?
Q6: What year did the Torsen 2's come out ?

I hope someone can assist me with these questions.... (i can't wait to
start some serious hoodlum drifting in the big UCF21..... especially in the rain!!!!!! ) Yihhhhhhhhhhaaaaaaaaarrrrrrrrr !!!!

 

[fastegg]

1996 LS400 diff 'clock'

When your talking about the diff you said that the clock was different.
What is the clock ?

 

[hypronet]

hi there,

There are currently three types of Torsen differentials.

1. The original Torsen T-1 (Type A) uses crossed axis helical gears to increase internal friction. The Type I can be designed for higher torque bias ratios than the Type II, but typically has higher backlash and the potential for Noise, Vibration, and Harshness (NVH) issues, and requires a precise setup/installation.
2. The later Torsen T-2 (Type B) uses a parallel gear arrangement to achieve a similar effect. There is also a specialist application of the T-2, known as the T-2R (RaceMaster).
3. The latest Torsen T-3 (Type C) is a planetary type differential, in that the nominal torque split is not 50:50. The Type C is available as single or twin version; the Torsen twin C differential has front and center differential in the same unit.[2]

what i installed in my ls400 was a "B" series diff, which was out off a 97 mark4 supra?

Clock?
im not sure what you mean by clock?
But i did state that there is a difference between a supra diff (8") to a ls400 diff (8 3/4").
now soarers are the same as a supra diff
both soarer's an supra's diffs are fixed to the diff subframe by 4 locations, while the early ls400 diffs are located in 3 locations.

I did read some where on this forum, that the late model ls400 ( from 96 onwards i think) do use the same diff subframe as a soarer?

So in saying that, you should be able to fit a soarer or supra diff very eazy with very little mods into a late model ls400?

So how is your diff located in the subframe?
by 3 or 4 mounts?
____________________________________________
http://www.lextreme.com/forums/showthread.php?t=9037
:sgrin:There is No substitute for cubic inch, except for BOOST !!!!:sgrin::burnout:
"91 LS400" Argo rods, CP pistons 9:1, Custom Tighte Cams, Whipple supercharger 20psi, Torsen Lsd,
Dual TB's, Whiteline swapbars, 97 RZ Supra brakes, Airbag & controller

 

[fastegg]

The 'clock'

G'day Hypronet.... i typed 'clock' into a drivetrain seach window.....


we are rebuilding the diff on a '96 LS400 (UCF 20)...this is not the same as a '91 LS400 diff.
The Torsen diff doesn't fit in the "clock"....
We are thinking of changing the subframe to a 97 LS400 (vvti), which equals the Supra subframe...

Anybody knows which other lsd-diff does fit into the '96 LS400 so don't have the complete sub-frame ????

We want both wheels spinning...no mig diff :madfawk:
THX !

 

[hypronet]

Mate, there is no clock???
i think someone doesnt know the correct terms
I think you will find, that what they are talking about maybe subframe, diff housing or case, crown or ring gear, pinoin gear.
LOL, there is no clock in a diff, sorry, diffs dont go tic toc they go bang

so how many mount points does your diff have? this is where the diff mounts to the subframe under the car
3 or 4

if you have 4, then you have a 8" diff housing which is the same as the soarers an supras, then you can pick between a torsen 1 or 2 center to place in it?

all 8 3/4" diffs have 3 mount points, an you cant put a center from a 8" diff into it ?

An as i explained in my write up, i removed my 8 3/4" single leg diff for a 8" torsen diff, but i had to change the front mounting locations on the subframe for it to mount correctly, original axles bolted straight up.

you need to work out how many mounting points the diff you have first before you can move on.
____________________________________________
http://www.lextreme.com/forums/showthread.php?t=9037
:sgrin:There is No substitute for cubic inch, except for BOOST !!!!:sgrin::burnout:
"91 LS400" Argo rods, CP pistons 9:1, Custom Tighte Cams, Whipple supercharger 20psi, Torsen Lsd,
Dual TB's, Whiteline swapbars, 97 RZ Supra brakes, Airbag & controller

 

[hypronet]

forgot to add

if you intend to run some big hp or torque to the rear end, better off with a 4 mount diff then a 3 mount diff, as the last thing you need is to see you diff on the ground then in the car

____________________________________________
http://www.lextreme.com/forums/showthread.php?t=9037
:sgrin:There is No substitute for cubic inch, except for BOOST !!!!:sgrin::burnout:
"91 LS400" Argo rods, CP pistons 9:1, Custom Tighte Cams, Whipple supercharger 20psi, Torsen Lsd,
Dual TB's, Whiteline swapbars, 97 RZ Supra brakes, Airbag & controller

 

[fastegg]

1998 ls400

G'day Mr Hydronet.... my diff has 4 point mount.... so this means its an 8" ?
.. So why would the earlier 3 point diff be a bigger 8 3/4' ?

 

[Armed_N'_Hammered]

Has anyone gone any further with their diff swaps?

I was looking for diff centers today and found cusco makes one for the LS400 but the price was over 2K. Not sure if that is compairable to having Kaaz custom build one.

Maybe this would be a more cost effective way of getting LSD into our LS than swapping to a supra diff? That is if no one is concerned with changing gear ratios...

 

[fastegg]

hi mr. Armed_N'_Hammered....
what year model was that cusco for ?
.. and yeah, i'm still dead keen to go a LSD for my Lexy..... Its just that i'm fixing some damage i did to mine 2 months ago.... finding a good front cut proving slow.... there's plenty of UCF10's but not UCF21's...... but as soon as that's fixed, the diff is the next project..... I think i'll go down the road of looking for a '96 or later Supra diff with a Torsen 2 centre and use my gearing.....

 

[Armed_N'_Hammered]

They had all models available.

http://www.cusco.co.jp/products/2010/03_lsd_p155_p220/03_lsd_p157.pdf

 

[fastegg]

The great diff debate

yeah well that's a bit of a mistery... as ive always thought that the diff centre was different on the UCF10 and UCF20. Even on these forums, the concensus seems to confirm that. However on both the Kaas (DAT3020) and Cusco (HBD192A) web site's they say that their LSD units are the same for both UCF10 & 20, '01 onwards Supra and Soarer.
.... Now i spent months going thru toyota diff part numbers on the site
toyodiy.com and according to their part numbers, both the UCF10 and UCF20 both had different diff centre part numbers.
The part numbers for open diff cases (centres) are the same for all the Soarer's from '91 onwards...UZZ30,31,40. and JZZ30,31 and 32 And Supra's from '91 onwards (except 6MT) ... and the UCF20. And they all quote the same LSD part number (where applicable) Now that means i guess that the Tosen 1 and Torsen 2 should fit every Soarer and SC300/400 '91 onwards including UCF20 &21.
Now i know guys put LSD's in UCF10's but i'm not sure what there out of.. I just don't know why the part numbers for the UCF10 diff don't match anything else.... Maybe someone else can she some light on that...

 

[fastegg]

correction

correctionfrom that last post...
It was from '91 onwards Supra and Soarer.

 

[Armed_N'_Hammered]

Anyone know if the Crown or Majesta have the same diff as Celsior? Found Cusco LSD available for those for about $1500.

 

[fastegg]

Hey Mr Armed....
... The crown is a majesta depending on year.... and what type of
Celsior ? UCF ?