Differential Options
12-10-14, 07:22 PM
#1
Driver School Candidate
Thread Starter
iTrader: (1)
Join Date: Dec 2014
Location: Missouri
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
Differential Options
I just bought a 92 SC300 5 speed and I've done a little research but I was wondering what are some LSD options for swapping into the SC300. So far the only one I've seen a lot of is a tt auto diff.
12-11-14, 01:47 AM
#2
Congratulations on your purchase! You have some options but they aren't cheap. A lot of info on the forum on this but briefly:
A Torsen LSD can only be had used from a Supra MKIV.
MKIV TT Auto 3.769:1 Torsen pumpkin ~ around $500-$600 for the diff only and around $1,000 for the whole pumpkin.
MKIV NA 5-speed OR Auto Torsen LSD was an extremely rare option. 93.5-96 was a 4.272:1 ratio and 97-98 was a 4.083:1 ratio just like your SC300 5-speed.
The NA Torsens are the same part but they are extremely rare to find for sale. Alternatively you can buy a TRD 2-way clutch-type LSD which is excellent but $1,000 for the LSD itself. There are others by Kaaz and very expensive ones by OS Giken (who sell a road-race worthy 1.5-way for $1,800)
You will likely need to take whichever LSD you buy (new or used) to a specialist shop to have it added to your differential which means a full rebuild and re-shim for it. That is, unless you happen to find a Torsen pumpkin from an NA Supra in which case you will have a suitable final drive ratio.
Not cheap altogether but very worth it in the end. Also, consider what you ultimately want to set your car up for:
If you plan to stay NA and leave the engine alone and focus on suspension, LSD, brakes, and other handling modifications I would recommend getting your LSD set up for your stock 4.083 ratio or a 4.272 ratio. I highly recommend the latter for NA use. It's also the same ratio early Supra NA LSD cars used. I have that setup in my DD and it's great.
...Until you decide you want to NA-T or GTE swap your car. Then you will want a lower ratio. I'm going on five years waiting on my GTE swap so getting all the extra work done to set up my LSD for an NA ratio was worth it to me. If you don't see yourself waiting that long to seriously consider turbocharging, stick with a stock TT Auto LSD diff which has a turbo-friendly 3.769 ratio or if you can't find one of those and buy a bare Torsen or an aftermarket LSD, set up with a 3.92 SC400 ratio.
As you can see, it's not as simple as just getting any LSD. You need to have it set up for the type of engine application you plan to run.
A Torsen LSD can only be had used from a Supra MKIV.
MKIV TT Auto 3.769:1 Torsen pumpkin ~ around $500-$600 for the diff only and around $1,000 for the whole pumpkin.
MKIV NA 5-speed OR Auto Torsen LSD was an extremely rare option. 93.5-96 was a 4.272:1 ratio and 97-98 was a 4.083:1 ratio just like your SC300 5-speed.
The NA Torsens are the same part but they are extremely rare to find for sale. Alternatively you can buy a TRD 2-way clutch-type LSD which is excellent but $1,000 for the LSD itself. There are others by Kaaz and very expensive ones by OS Giken (who sell a road-race worthy 1.5-way for $1,800)
You will likely need to take whichever LSD you buy (new or used) to a specialist shop to have it added to your differential which means a full rebuild and re-shim for it. That is, unless you happen to find a Torsen pumpkin from an NA Supra in which case you will have a suitable final drive ratio.
Not cheap altogether but very worth it in the end. Also, consider what you ultimately want to set your car up for:
If you plan to stay NA and leave the engine alone and focus on suspension, LSD, brakes, and other handling modifications I would recommend getting your LSD set up for your stock 4.083 ratio or a 4.272 ratio. I highly recommend the latter for NA use. It's also the same ratio early Supra NA LSD cars used. I have that setup in my DD and it's great.
...Until you decide you want to NA-T or GTE swap your car. Then you will want a lower ratio. I'm going on five years waiting on my GTE swap so getting all the extra work done to set up my LSD for an NA ratio was worth it to me. If you don't see yourself waiting that long to seriously consider turbocharging, stick with a stock TT Auto LSD diff which has a turbo-friendly 3.769 ratio or if you can't find one of those and buy a bare Torsen or an aftermarket LSD, set up with a 3.92 SC400 ratio.
As you can see, it's not as simple as just getting any LSD. You need to have it set up for the type of engine application you plan to run.
Last edited by KahnBB6; 12-11-14 at 01:56 AM.
05-06-22, 02:49 AM
#3
2nd gear
Join Date: May 2022
Location: PA
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
Congratulations on your purchase! You have some options but they aren't cheap. A lot of info on the forum on this but briefly:
A Torsen LSD can only be had used from a Supra MKIV.
MKIV TT Auto 3.769:1 Torsen pumpkin ~ around $500-$600 for the diff only and around $1,000 for the whole pumpkin.
MKIV NA 5-speed OR Auto Torsen LSD was an extremely rare option. 93.5-96 was a 4.272:1 ratio and 97-98 was a 4.083:1 ratio just like your SC300 5-speed.
The NA Torsens are the same part but they are extremely rare to find for sale. Alternatively you can buy a TRD 2-way clutch-type LSD which is excellent but $1,000 for the LSD itself. There are others by Kaaz and very expensive ones by OS Giken (who sell a road-race worthy 1.5-way for $1,800)
You will likely need to take whichever LSD you buy (new or used) to a specialist shop to have it added to your differential which means a full rebuild and re-shim for it. That is, unless you happen to find a Torsen pumpkin from an NA Supra in which case you will have a suitable final drive ratio.
Not cheap altogether but very worth it in the end. Also, consider what you ultimately want to set your car up for:
If you plan to stay NA and leave the engine alone and focus on suspension, LSD, brakes, and other handling modifications I would recommend getting your LSD set up for your stock 4.083 ratio or a 4.272 ratio. I highly recommend the latter for NA use. It's also the same ratio early Supra NA LSD cars used. I have that setup in my DD and it's great.
...Until you decide you want to NA-T or GTE swap your car. Then you will want a lower ratio. I'm going on five years waiting on my GTE swap so getting all the extra work done to set up my LSD for an NA ratio was worth it to me. If you don't see yourself waiting that long to seriously consider turbocharging, stick with a stock TT Auto LSD diff which has a turbo-friendly 3.769 ratio or if you can't find one of those and buy a bare Torsen or an aftermarket LSD, set up with a 3.92 SC400 ratio.
As you can see, it's not as simple as just getting any LSD. You need to have it set up for the type of engine application you plan to run.
A Torsen LSD can only be had used from a Supra MKIV.
MKIV TT Auto 3.769:1 Torsen pumpkin ~ around $500-$600 for the diff only and around $1,000 for the whole pumpkin.
MKIV NA 5-speed OR Auto Torsen LSD was an extremely rare option. 93.5-96 was a 4.272:1 ratio and 97-98 was a 4.083:1 ratio just like your SC300 5-speed.
The NA Torsens are the same part but they are extremely rare to find for sale. Alternatively you can buy a TRD 2-way clutch-type LSD which is excellent but $1,000 for the LSD itself. There are others by Kaaz and very expensive ones by OS Giken (who sell a road-race worthy 1.5-way for $1,800)
You will likely need to take whichever LSD you buy (new or used) to a specialist shop to have it added to your differential which means a full rebuild and re-shim for it. That is, unless you happen to find a Torsen pumpkin from an NA Supra in which case you will have a suitable final drive ratio.
Not cheap altogether but very worth it in the end. Also, consider what you ultimately want to set your car up for:
If you plan to stay NA and leave the engine alone and focus on suspension, LSD, brakes, and other handling modifications I would recommend getting your LSD set up for your stock 4.083 ratio or a 4.272 ratio. I highly recommend the latter for NA use. It's also the same ratio early Supra NA LSD cars used. I have that setup in my DD and it's great.
...Until you decide you want to NA-T or GTE swap your car. Then you will want a lower ratio. I'm going on five years waiting on my GTE swap so getting all the extra work done to set up my LSD for an NA ratio was worth it to me. If you don't see yourself waiting that long to seriously consider turbocharging, stick with a stock TT Auto LSD diff which has a turbo-friendly 3.769 ratio or if you can't find one of those and buy a bare Torsen or an aftermarket LSD, set up with a 3.92 SC400 ratio.
As you can see, it's not as simple as just getting any LSD. You need to have it set up for the type of engine application you plan to run.
So far I understand that I need either an SC400 3.26 or 3.92 diff and an aftermarket LSD.
But I also found a 93-96 6MT B03B Torsen LSD w/ Diff. Is this compatible with my application? Is the LSD suitable to be dropped in the SC400 diff?
05-06-22, 06:13 PM
#4
I have a 92 SC300 w/ Auto Transmission that I plan on getting a Turbonetics T04 Kit for.
So far I understand that I need either an SC400 3.26 or 3.92 diff and an aftermarket LSD.
But I also found a 93-96 6MT B03B Torsen LSD w/ Diff. Is this compatible with my application? Is the LSD suitable to be dropped in the SC400 diff?
So far I understand that I need either an SC400 3.26 or 3.92 diff and an aftermarket LSD.
But I also found a 93-96 6MT B03B Torsen LSD w/ Diff. Is this compatible with my application? Is the LSD suitable to be dropped in the SC400 diff?
So no unfortunately you will not be able to use that 6-speed factory LSD in your SC400 diff.
....
The factory Torsen you'll need to find is from a 1993-1998 Supra TT Automatic 3.769:1 (most often a Torsen T-1 but it changed to a T-2 Torsen for '97-'98 as optional equipment), or from a 1993-1998 Supra NA that had the same Torsen as a very rare option (4.272:1 for 93-96 and 4.083:1 for 97-98), or from an Aristo TT (3.769:1) or Soarer Z30 1JZ-GTE or other noon 1JZ Z30 Soarer that had it as a rarer option.
The very rare T-2 is stronger than the already rare to find T-1. The T-1 is generally considered good until about 450-500whp.
Aftermarket clutch-type LSD center options include the discontinued TRD 2-way, Kaaz 2-way and 1.5-way, OS Giken 2-way and 1.5-way and others.
.....
As for the actual diff *ratio* that is ideal, an SC400's 3.92 is a good fit for an automatic application and was actually the stock ratio used in all Z30 Soarer 1JZ-GTE Automatic models.
Further, you will need to look into finding a used Supra TT Auto, Aristo TT or other 1JZ-GTE automatic transmission as they are built stronger from the factory to handle boost applications and are the best to have built for even higher horsepower and torque ceilings.
Thread
Thread Starter
Forum
Replies
Last Post
moto696
Performance & Maintenance
8
03-14-11 02:10 PM