Go Back   Club Lexus Forums > Lexus Model Forums > SC Models > SC 400/300 > Performance & Maintenance
Sign in using an external account
Register Forgot Password?

LS430 Diff?

Thread Tools Search this Thread Display Modes
Old 07-28-14, 04:29 AM   #1
Lead Lap
Trader Score: (1)
Biddles's Avatar
Join Date: Jan 2013
Location: NY
Posts: 727
Default LS430 Diff?

Saw a guy selling his car on ebay stating he has a LS430 3.26 LSD in his auto SC400 and that he's getting higher MPG.

I believe our SC400's are geared around 3.9, so I can see the 3.2 being a MPG benefit, but can't find any info about it. Has anyone used an LS430 diff in our cars?
This ad is not displayed to registered members.
Register your free account today and become a member on Club Lexus!
Biddles is offline   Reply With Quote
Old 07-30-14, 07:51 PM   #2
Lead Lap
Trader Score: (5)
Halon's Avatar
Join Date: May 2010
Location: MN
Posts: 736
Send a message via AIM to Halon

I have an SC430 diff in mine (3.26). No idea if it's the same as the LS.
Brandon - Twin Cities FlexFuel Mafia
1991 TSi AWD E85 - BEP S362, DSMLink V2, Built 2.0L Idle Vid, 628hp Graph, 541hp Vid, 10.93@137 Vid
1992 SC300 E85 - Borg 84-75, Megasquirt 3/3x, 2jzge, 350z 6spd Idle Vid, 406hp Vid, Drivability Vid
2006 Bayliner 195 - Carbed 5.0 Top Speed Test
Halon is offline   Reply With Quote
Old 08-01-14, 03:16 AM   #3
Lexus Champion
Trader Score: (3)
Join Date: Jun 2010
Location: California
Posts: 1,870

Biddles, you can't use an LS430 diff. You can use a diff from an SC300/400, SC430, GS300/400 and Supra MKIV.

The 3.26 diff was available in the 1998-00 SC400 and 1998+ GS400. It's useful if you have a V160 6-speed transmission (because it's numerically similar to the MKIV Supra TT 6-speed's 220mm 3.133:1 ratio diff) or the 290HP 1UZ-FE V8 and 5-speed automatic that came in those two cars. You CAN use it but you're going to have very sluggish acceleration in every gear if you use it in a 1992-97 SC400. I think some folks have used it in their R154 JZ turbo SC's but it's not the best matched gear for anything other than the above two setups (6-speed manual and 5-speed auto V8).

A Supra TT Automatic (LSD or open) 3.769 is your next step down from the 3.92 SC400 gearing but it's an expensive switch.
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
KahnBB6 is offline   Reply With Quote
Old 08-01-14, 06:08 AM   #4
Lexus Test Driver
Trader Score: (4)
Vrank's Avatar
Join Date: Feb 2011
Location: TX
Posts: 892

I was under an is350 yesterday, diff looked almost the same
Vrank is offline   Reply With Quote
Old 08-01-14, 06:18 AM   #5
gte & na-t
Trader Score: (44)
99SC42's Avatar
Join Date: Jan 2007
Location: In front of you
Posts: 5,003

I Have an LS430 diff in my SC it works fine on the SC.
99SC42 is offline   Reply With Quote
Old 08-01-14, 03:25 PM   #6
Lexus Champion
Trader Score: (3)
Join Date: Jun 2010
Location: California
Posts: 1,870

99SC42 -- if you found that an LS430 diff bolted right in that's a new one on me and I don't think it's common knowledge for SC, GS and Supra MKIV owners. Owners should be made more aware if it's the same diff pumpkin down to the mounting points.

Vrank -- This is true. The IS350 and IS-F rear diffs look VERY similar to the SC/GS/MKIV 200mm rear differentials. There was an IS-F diff thread elsewhere on CL where this was discussed but it did look as if only the ears were cast in the same location. I can't remember specifically but there were slightly different mounting points on the IS350/IS-F castings even though they are probably internally the same 200mm design. Unless there are differences in pinion diameter and/or length it's very possible that the internals are swappable to a traditionally SC-compatible pumpkin. Don't hold me to that last speculation because I haven't confirmed or tried it but it would make sense Toyota would re-use most of their diff designs for certain applications. They did it using the MKIII/Cressida/IS300/IS250 diffs in the FR-S after all.
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

Last edited by KahnBB6; 08-01-14 at 03:28 PM..
KahnBB6 is offline   Reply With Quote
Old 08-01-14, 07:24 PM   #7
Lexus Test Driver
Trader Score: (3)
Join Date: Jan 2011
Location: NY
Posts: 946

3.26 diff is better for highway mileage. It's barely ok on my 2.5L 1JZ. Would be even better with a bit more torque to help it pull at 1500rpm at 70mph in top gear on the auto.
Daytona Blue 350Z (VQ-35DERevup)
Imperial Blue Trailblazer SS (LS2)
Royal Jade Pearl SC300 (2JZ-GE+W58 --> 1JZ-GTE+R154) CT12A twin turbo @23psi --> TO4S 60-1 P-trim T4 .70 A/R @ 21psi

AEMv2/BC272/SP-QSV/Kaaz SQ-LSD/LQ9coils/water-meth/4"single--- build in progress
Originally Posted by ajmccarrel View Post
Are you one of those annoying flamers that always thinks the answer to everything is a 2JZ swap?
INTIMAZY is online now   Reply With Quote
Old 08-01-14, 07:24 PM

Similar Threads
Thread Thread Starter Forum Replies Last Post
3.266 diff crown and pinion - fit ISF diff or not? Sci IS F 23 11-08-14 10:26 AM
rear diff question isupra600 Performance 0 10-09-14 07:58 AM
CA 3 complete diff and pumpkins and power steering line 2jzinsider SC400 / 300 Classifieds 6 02-17-13 09:37 PM
GS430 vs. GS400 Differentials... exactly the same or different? 97-SC300 Performance 1 07-14-12 03:12 PM
question: is the SC400 diff same as the LS400 diff? recoil LS400 8 07-08-08 11:04 AM

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -7. The time now is 02:36 PM.

Join ClubLexus

Copyright © 2000-2008 Internet Brands, Inc. All Rights Reserved
Privacy Policy | Disclaimer | Terms of Use | JOBS

Get all contact info