Removing the rear differential... it's stuck.
Thread Starter
G35x - RWD/AWD goodness
Joined: Jul 2001
Posts: 2,950
Likes: 1
From: Michigan
Clint,
Sorry I didnt' make that clear, I didn't need to swap half shafts as my stock SC ones just fell into place and bolted right up. My dad also came up with the x/y imput/output idea and it seems to be around 3 and 3/4. We're going to try to remove the LSD's tripod and put the one from the stock diff on it. I'll let everybody know how it goes tomorrow.
So if the stock half shafts fit, there's a good chance it's the TT auto LSD with the 3.76?
Wolff
Sorry I didnt' make that clear, I didn't need to swap half shafts as my stock SC ones just fell into place and bolted right up. My dad also came up with the x/y imput/output idea and it seems to be around 3 and 3/4. We're going to try to remove the LSD's tripod and put the one from the stock diff on it. I'll let everybody know how it goes tomorrow.
So if the stock half shafts fit, there's a good chance it's the TT auto LSD with the 3.76?
Wolff
Thread Starter
G35x - RWD/AWD goodness
Joined: Jul 2001
Posts: 2,950
Likes: 1
From: Michigan
Disaster
One word, disaster. 
The car had been up on jack stands for over a week and I my dad and I finished it Sunday night. Needless to say it stoped working and Lexus of Lansing "won't work on modified cars." I told them the truth that I had worked on it and they were no help.
I'm at a crossroads guys, I can put it back to stock (which I don't don't really want to do) or keep working on it (but I need to find a competent supra or other shop). I would really like to speak with somebody who knows about this type of mod. If you could PM with a phone number or if you can post information that would be of help I would be eternally grateful.
Wolff
The car had been up on jack stands for over a week and I my dad and I finished it Sunday night. Needless to say it stoped working and Lexus of Lansing "won't work on modified cars." I told them the truth that I had worked on it and they were no help.
I'm at a crossroads guys, I can put it back to stock (which I don't don't really want to do) or keep working on it (but I need to find a competent supra or other shop). I would really like to speak with somebody who knows about this type of mod. If you could PM with a phone number or if you can post information that would be of help I would be eternally grateful.
Wolff
Lexus Champion
Joined: Feb 2001
Posts: 3,124
Likes: 32
From: Texas
Hmmm... I thought the idea to swap the tripod sounded reasonable. Overclocker, what happened?
Also, reading from the Supra manual it lists the 6 speed as a 3.133 ratio with an 8.66" ring gear and the auto as a 3.769 ratio with a 7.87" ring gear.
Also, reading from the Supra manual it lists the 6 speed as a 3.133 ratio with an 8.66" ring gear and the auto as a 3.769 ratio with a 7.87" ring gear.
Lexus Champion
Joined: Feb 2001
Posts: 3,124
Likes: 32
From: Texas
Lexus Champion
Joined: Feb 2001
Posts: 3,124
Likes: 32
From: Texas
Here is a cutaway of the differential
http://www.mkiv.com/specifications/ncf/ncf93/ncf158.jpg
Here is the ratios and specs
http://www.mkiv.com/specifications/ncf/ncf93/ncf156.jpg
Here is the 6 speed ratios
http://www.mkiv.com/specifications/ncf/ncf93/ncf124.jpg
http://www.mkiv.com/specifications/ncf/ncf93/ncf158.jpg
Here is the ratios and specs
http://www.mkiv.com/specifications/ncf/ncf93/ncf156.jpg
Here is the 6 speed ratios
http://www.mkiv.com/specifications/ncf/ncf93/ncf124.jpg
Thread Starter
G35x - RWD/AWD goodness
Joined: Jul 2001
Posts: 2,950
Likes: 1
From: Michigan
jbrady,
Thank you very much for the links, I didn't even know that info was out there.
The minor update is I got the flange on but didn't set it up properly. I drove it and it locked up, but got the SC400 service manual after the fact. It seems you have to torque everything just right and there is a crush sleeve inside that I should have replaced, but didn't.
I took both the stock and Supra differentials to Sound Performance in Chicago to have them work on it. They were very friendly and knowledgeable and feel they can fix it and put the flange on properly. I'll update everybody when the work is done.
Wolff
Thank you very much for the links, I didn't even know that info was out there.
The minor update is I got the flange on but didn't set it up properly. I drove it and it locked up, but got the SC400 service manual after the fact. It seems you have to torque everything just right and there is a crush sleeve inside that I should have replaced, but didn't.
I took both the stock and Supra differentials to Sound Performance in Chicago to have them work on it. They were very friendly and knowledgeable and feel they can fix it and put the flange on properly. I'll update everybody when the work is done.
Wolff
Last edited by Overclocker; Oct 10, 2002 at 07:45 PM.
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Lexus Champion
Joined: Feb 2001
Posts: 3,124
Likes: 32
From: Texas
Wollf, glad to be of assistance. Found the info surfing. If only I could find the manuals for my 99 LS400... I could use an LSD but haven't seen ANYONE do it on my car. I have to believe that it uses the same components as the other HD Toyota stuff. My front brakes look exactly like Supra Turbo stuff, 12.6" rotors, big 4 piston calipers. One thing of interest is the gearing on the 98+ LS cars is 3.27 and the gearing on the 95-97 cars is listed as 3.62. If the carrier on the Supra is the same as the LS400s that would give these 2 ratios as available ring and pinion swaps on those wanting to improve over the 3.13 on the Supra Turbo. Now, Clint says it is already 3.27 but the 1993 manual says 3.13 so the actual ratio may be year specific.
The other interesting note is the size and ratio difference between the 6spds and automatics.
6spds, 3.133 ratio, 8.66" ring gear diameter
autos, 3.769 ratio, 7.87" ring gear diameter
Non turbos get the smaller ring gear with a higher ratio of 4.272 which could really wake up a NA SC400.
On high torque cars the 8.66 ring offers much more torque capacity as the pinion is larger as well as the ring.
The other interesting note is the size and ratio difference between the 6spds and automatics.
6spds, 3.133 ratio, 8.66" ring gear diameter
autos, 3.769 ratio, 7.87" ring gear diameter
Non turbos get the smaller ring gear with a higher ratio of 4.272 which could really wake up a NA SC400.
On high torque cars the 8.66 ring offers much more torque capacity as the pinion is larger as well as the ring.
Intermediate
Joined: Feb 2001
Posts: 421
Likes: 1
From: Texas
Sorry Lex, but to my knowledge most of the supra 6spd rear ends are 3.27s. Initially in 93 they came as 3.13, but were chagned the next year to 3.27, but I have even seen some places listing the 93s as having 3.27s so I am not really sure what is correct. I have seen tons of conflicting info from different reputable sources.
Either way, the difference is minor and of little consequence anyways.
Either way, the difference is minor and of little consequence anyways.
Last edited by sc300tt; Oct 13, 2002 at 02:27 PM.
Lexus Champion
Joined: Sep 2001
Posts: 3,244
Likes: 1
From: New York
Originally posted by sc300tt
Sorry Lex, but to my knowledge most of the supra 6spd rear ends are 3.27s. Initially in 93 they came as 3.13, but were chagned the next year to 3.27, but I have even seen some places listing the 93s as having 3.27s so I am not really sure what is correct. I have seen tons of conflicting info from different reputable sources.
Either way, the difference is minor and of little consequence anyways.
Sorry Lex, but to my knowledge most of the supra 6spd rear ends are 3.27s. Initially in 93 they came as 3.13, but were chagned the next year to 3.27, but I have even seen some places listing the 93s as having 3.27s so I am not really sure what is correct. I have seen tons of conflicting info from different reputable sources.
Either way, the difference is minor and of little consequence anyways.
All the one's i've seen have been 3.13 I believe, but I did some checking also, and like you said there's a ton of conflicting info. You do seem to have gotten me and jbrady on this one CP, because i've been told the later years are 3.27, even though one of the local guys here has a '95 (i'm pretty sure that's the year) and swears he has 3.13's, next time he stops by i'll have to mark his driveshaft and check. Small difference between the two ratios, but it would be good to end the debate, since there's a couple discrepancies on SC auto and 5spd gearing also....
SC3 auto 7.87" 3.92
SC3 5spd 7.87" 4.08, Clint I think you said it was 4.27
SC4 auto 7.87" 3.92, you disagree though, right?
Supra auto 7.87" 3.76
Supra 6spd 8.66" 3.13 for 1993/ 3.27 for 1994-up apparently
OK, can we clear this up, those who know speak up....
- Jon