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SC300 OEM Differential

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Old 01-21-14, 03:03 PM   #16
KahnBB6
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Originally Posted by Mage View Post
This is interesting.

I put 1 tire on mud, the other on the pavement. I hosed the gas. The tire on the mud spun, but very briefly. Then I felt the LSD kick in. The power was transferred to the other wheel (the diff locked up).

My car ('93 SC400) belonged to an old guy, that bought it new. There's no WAY it has been modified...
This has been covered before at least in some LS400 threads. Very old open diffs in these cars can occasionally exhibit some characteristics of an LSD but it has more to do with the bearings being worn and just being a bit lucky in terms of the situation. If you know the car's history and it was stock when you bought it there is no Torsen in there but the scenario you describe has happened before.

If you were to go drifting with your SC the differential would not react as if it had an actual LSD but doing burnouts and getting two strips is technically possible with an open diff under the right conditions. Replicating those conditions over and over is near impossible on a consistent basis.
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1993 SC300 5-speed NA | Built R154 | Gixxer_Drew Susp. 600/325 | TT: brakes FR, rims, rear sway, seats | Koyo rad | 4.272 TT Torsen LSD
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Old 01-21-14, 03:12 PM   #17
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which LSD is a direct drop in for a 97 oem w58? The TT auto diff?
I have a 93 SC (which until recently had the) original W58 5-speed with the same stock open diff as yours (4.083). The TT Auto Torsen 3.769 pumpkin will drop into any 92-00 SC300/400 but you would want no less than the gearing you already have or a 4.272 ratio (same as 93-96 Supra NA W58's). The 3.769 ratio will work but will totally kill your car's power delivery unless you're immediately going with an engine swap or NA-T build.

The absolutely direct drop in diff is an ultra-rare Torsen diff pumpkin from a 93-96 Supra NA (4.272 ratio) or 97-98 Supra NA (4.083 ratio). It's the same thing as a TT Auto Torsen pumpkin just with an NA ratio. Extremely hard to come by.

What I did was buy a 94 TT Auto Torsen pumpkin and a GS300 4.27 pumpkin and had Driftmotion rebuild the TT pumpkin with the 4.27 ratio. I kept the 3.769 TT ring and pinion for future use.

It's all tedious but it's worth it in the end.
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Old 01-21-14, 03:37 PM   #18
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Originally Posted by hmhatch View Post
You sure that's not a 6 speed diff? If so it will not work with your ring gear.
I'd have to look into it for sure to tell you, but I wouldn't buy the 6speed LSD, because it wouldn't fit our pumpkins, they use different housing.
Edited
Ok you're right hmhatch, it is a 6speed rear end, I just went back to see my ebay history, ok I did say they wouldn't fit, that's with 6peed ring gear
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Old 01-21-14, 04:48 PM   #19
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I'd have to look into it for sure to tell you, but I wouldn't buy the 6speed LSD, because it wouldn't fit our pumpkins, they use different housing for the 6 speed LSD
12 holes on the outer ring is 6 speed diff
10 holes is from auto TT or N/A 5 speed

This link can answer most of the future diff questions as far as ratios


http://www.supraforums.com/forum/sho...ferential-Info!
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Old 02-01-14, 09:59 PM   #20
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Originally Posted by 3L4jzz31 View Post
Any one notice or confirm this from the link (2nd post)?

*Canadian market SC400's came with a Torsen LSD - US spec SC400's did not.
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Old 02-03-14, 08:51 PM   #21
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It was based on some guy having an lsd in his sc400 when the previous owner said he did no modifications. He never prooved that he had one but they took his word on it and put it in there
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Old 02-03-14, 08:51 PM
 
 
 
 
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clutch, diff, differential, drift, gasket, lexus, limited, lsd, oem, options, sc, sc300, slip, torsen, type

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