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View Poll Results: Will Supra Auto TT LSD work in sc300 rear pumpkin w/ stock ring gear & pinion shaft?
Yes 80 89.89%
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Supra Auto TT LSD Install in sc300 pumpkin?

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Old 03-26-10, 06:32 AM   #61
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Quote:
Originally Posted by fastegg View Post
hi... what does 6mt, 5mt and 4eat mean ? i have a 1998 LS400 and are looking for LSD solution...

6mt=6 speed manual, 5mt=5 speed manual and 4eat=4 speed automatic transmission.
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Old 03-28-10, 02:47 AM   #62
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Default LSD swap

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Originally Posted by Blizzy View Post
Any SC rear end is compatible with the Supra TT Auto LSD. Any SC rear end is also compatible with the Supra n/a LSDs (both 5MT and 4AT).

The only Supra LSD that is not compatible with the SC rear ends is the TT 6MT LSD.

I have personally swapped a TT Auto LSD into an SC300 A/T rear end. I have a good friend on the forums who has done the same swap into an SC400 rear end.
are you guys just swapping the LSD torsen unit ?
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Old 03-28-10, 02:54 AM   #63
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Default Pm ?

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Originally Posted by nate579 View Post
Nope it's Open DIff, but from my understanding, TRD LSD Auto will fit SC300/400, there are few 400 on the forum running them, do a search to find out who and you can pm them for more specific information.
you say "you can PM them for more specific info" .... what does PM mean ?
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Old 03-28-10, 03:00 AM   #64
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Default Kaaz lsd

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Originally Posted by vntperform View Post
Dejacky: If your interested I have a used Kaaz LSD (Auto) out of my 97 Supra TT Auto with under 500 miles on the lsd for $650 + s/h.

PM me if interested, forgive me for hi-jacking your thread.

BTW, I love your videos on youtube.com
this KAAZ LSD you have should bolt straight up to my 1998 LS400 ring gear ?
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Old 03-28-10, 03:03 AM   #65
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Default pumpkin

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Originally Posted by VincentLex View Post
Why don't you use the entire pumpkin? I have a '95 SC300 also and I want to go with a LSD. I was trying to double check to make sure that the pumpkin from a Supra TT is a direct bolt on and what the gearing is so I make sure I buy the right thing. Don't mean to hijack your thread but I'm looking for the same basic info. Any help is appreciated.
when you say 'pumpkin' what exactly are you referring to ?
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Old 03-29-10, 05:50 PM   #66
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I have a question... I am going to be using an r154 transmission from my stock w58 so will I be needing to use a different driveshaft if I swap the entire tt auto rear pumpkin???
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Old 07-11-10, 10:53 AM   #67
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ok so i am thinking about getting the TRD LSD (3.76 is that right?) and which of the install kits should i get, the TT 5pd or the NA 5spd?

also, i originally was thinking about getting the Cusco RS LSD. what is the ratio for that?
also would i need the install kit?

would you recommend the TRD or the Cusco?

i hate making new topics so i decided to resurrect this one.

thanks for any inputs.
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Old 07-11-10, 02:10 PM   #68
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It's not the LSD that dictates the gear ratio. You can install a LSD in your stock pumpking and still retain your gear ratio. For example, I have TRD in my SC300 pumpking and still have the same gear ratio of 4.27. YOu have to change the ring gear to change the ratio. LSD is just away of getting the power to the wheels.

Some correct me if I am wrong., below are the gear ratio for some lexus and toyota cars. Thank you search function.

If you swap out the whole rearend (pumpkin) of your car with a supra or SC400, with LSD installed then you will have a different gear ratio. But just dropping the LSD in the stock pumpkin. No change, just more grip.

From Lextreme's forum
1993-1998 Supra TT manual - 3.133 (torsen)
1998+ Lexus V8 Cars VVTi - 3.266 (open differential only)
1990-1997 LS400 - 3.62 (open differential only)
1993-1996 Supra TT auto - 3.769 (torsen, 3.77 not the usual 3.76 quoted)
1997-1998 Supra TT auto - 3.769 (open standard, torsen available)

1992-1997 Lexus SC400 - 3.912 (open differential only)

1992-1998 Lexus SC300 manual - 4.08 (open differential only)
1997-1998 Supra non turbo - 4.08 (open standard, limited slip available)
1992-2000 Lexus SC300 automatic - 4.272 (open differential only)
1993-1996 Supra non turbo - 4.272 (open standard, limited slip available)

Last edited by nate579; 07-12-10 at 03:53 AM.
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Old 07-12-10, 01:55 AM   #69
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yup, correct!
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Old 07-12-10, 04:48 AM   #70
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ahhh wow haha thanks for clearing that up.

also, i have read that changing the pumpkin can lead to your speedometer not reading correctly. is this true? if so, how would you be able to remedy this?
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Old 07-12-10, 09:10 AM   #71
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Quote:
Originally Posted by ronricorum View Post
ahhh wow haha thanks for clearing that up.

also, i have read that changing the pumpkin can lead to your speedometer not reading correctly. is this true? if so, how would you be able to remedy this?
with something like this:
http://www.bluegauges.com/prod_yellow_box.htm

"How it works
The Yellow Box is installed in the vehicle and corrects the speedo signal
in real-time. It can be re-adjusted at any time to correct for changes in
gearing and wheel sizes."
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Old 07-12-10, 10:22 AM   #72
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you are awesome! thanks! =D

now time to research where to buy a tt auto pumpkin!
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Old 07-28-10, 07:13 PM   #73
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(auto sc300 pumpkin) so how do u swap the rear end and keep the stock auto tt gear ratio wanna have the auto tt gears...

would it be more cost effectly to just buy a whole working auto tt pumpkin
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Old 07-28-10, 09:12 PM   #74
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Quote:
Originally Posted by boostgotme View Post
(auto sc300 pumpkin) so how do u swap the rear end and keep the stock auto tt gear ratio wanna have the auto tt gears...

would it be more cost effectly to just buy a whole working auto tt pumpkin
yes that would be the most cost effective way, cause if you cant do the work yourself then you have to pay for the LSD intall. The problem is, the Supra auto TT diffs are getting kinda scarce. If you find one for sale there anywhere from 500-900 plus shipping. Kaaz lsd on eaby 800.
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Old 07-28-10, 09:18 PM   #75
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Quote:
Originally Posted by suprus View Post
I have a question... I am going to be using an r154 transmission from my stock w58 so will I be needing to use a different driveshaft if I swap the entire tt auto rear pumpkin???
No, you just have to change the coupler on the end of the diff to bolt to the driveshaft. Just use the one off your stock diff.
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auto, automatic, change, differential, gearing, install, lexus, lsd, mkiv, ratio, sc300, sc400, stock, supra, tt

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