pitmanr200

What is stock ratio on 98 gs400? and will i see inprovement on stock car? Also will tc and snow and power modes still work.

Rock-a-Lex

iTrader: (4)

3.23...the 3.76 (Supra TT) LSD is a great mod for this car! You WILL see a lot better acceleration but will lose 1-2 MPG because you will ALWAYS be at a higher RPM at any given speed in any given gear as compared to stock. GL!

pitmanr200

so what about all the power and snow mode and all the traction controll does it all still work.

Rock-a-Lex

iTrader: (4)

Yes...........

AW99GS400

I was told supra TT 6sp manual and automatic has different LSD ? will both fit a GS 400 ?

adrian

Gs430Boi

Does any dash light come on with this and torque converter upgrade install

Rock-a-Lex

iTrader: (4)

The upgraded torque converter has been known to cause a CEL only on GS430's...

qgoat

Can the speedometer be recalibrated to match the new gear ratio?

IAGS400

Nothing needs to be done. The speedometer works from a sensor on the wheel. Only a change in tire diameter will change the speedometer.

JBrady

3.266

Supra TT automatics have 3.769
Supra TT 6 speeds have 3.13

The supra TT automatic carrier is bolt in. The supra TT 6 speed is not.

All 6 speed supras were LSD. Not all supra TT automatics where. Confusing and many do NOT know what they have.

kevs98GS4

iTrader: (1)

supra 6 speeds are 4.1

JBrady

Nope. 6 speeds were turbo only and had a 3.133 ratio

The NON turbo 5 speeds are 4.272 for 1993-1996 and then 4.083 for 1997-1998

The 6 speed turbos used the worm style LSD in all year models.
The automatic turbo used worm style LSD for 93-96 years and then went to the helical style LSD for 97-98 and LSD was an OPTION on 97-98 turbo automatics.

Non-turbo supras also had OPTIONAL(rare) LSD and used a worm style LSD model years 93-96 and then helical style in 97-98.

IAGS400

Another reference

SUPRAboy80

Which is better for the GS400? worm style or helical style? and why?

JBrady

Either is fine. Since the 6 speed TT used worm style in all years that would SEEM to suggest it is possibly stronger. Of course the 6 speed differential is not a direct bolt on.

So, a used automatic TT worm style would be older and possibly more worn than any used helical style.

If you can find either one in good condition I would get it. That said MANY 1997-1998 turbo supra owners are unaware if their automatic actually has a torsen (helical for these years). Many have basic open differentials. Some sell these as torsen when in fact they may not be. The ONLY way I am aware of to make a positive determination is OPEN IT UP and LOOK. I actually bought one a few years back and had this problem. The seller was POSITIVE it was a torsen and initially accused me of not knowing the difference and then lying. He finally believed me and refunded my money.