Swainbuilt

iTrader: (3)

Gust wondering if anyone has tried the GS300 diff (3.92) in a GS400? I know it is popular to run the 3.76 ( still a bit lower than the stock 3.26 GS400 gears) from a Supra Turbo auto. The GS300 diff is sure alot cheaper and easier to get ahold of. Is the 3.92 to low?

TLW

first welcome to Club Lex

2nd those gears in a 400 would knock your top end down to atleast the 120's

now im guessing but with 3.76 gears top speed from what i have read is 135

those gears are pretty high ...while i doubt you would have a problem with off the line start the rest might be a problem

now for arguments sake i dont have those gears nor will i ever

not too mention ...still only one wheel spinning

but if you like try tit out if you get it for the right price and report back

-johnny

chuckb

I'm sure it would net better 1/4 mile times but it would prob hurt driveability a little. you'd be flying through the gears though.

BTW- I don't think stock rear end is total one wheel wonder. When I did a little test burnout in my 430 it was posi I think if you're pointed straight the stock rear is "posi" right?

TLW

sorry but is unless you bought a modified one

chuckb

really? 100% of the time? I did a small burnout in my driveway once and it was both tires

rominl

iTrader: (4)

that's not true. if you are on a straight line, with the ground material being the same left and right, and you floor it, you WILL see both wheels spin. the open differential works that way

RRocket

I agree. The difference from 3.76 to 3.92 wouldn't be a big difference at all. Maybe 50-100 RPMS difference while cruising. You'd drop from 135MPH to 129MPH or so. So not big at all. You'd be hard pressed to tell the difference unless someone told you. I've had cars where I've made small gear changes like that, and could scarcely tell in my own car.....

Ok..I did a calculation in one of my programs..these are approx.

At 60mph with 3.27, you'd be turning about 2100RPM

At 60mph with 3.76, you'd be turning about 2400RPM

At 60mph with 3.92, you'd be turning about 2500RPM


At 5500RPM with 3.27 you be going 157MPH

At 5500RPM with 3.76 you be going 137MPH

At 5500RPM with 3.92 you be going 131MPH

(these numbers are with 17" wheels, and don't take into account aerodynamics, resistance, etc..)

Swainbuilt

iTrader: (3)

Thats not to bad! From the reserch I have done, you can find an SC400 diff with LSD and 3.92 gears pretty afordable. 100 rpm difference at 60mph is worth the money savings. I can't afford to drive over 100mph that often anyways! Tickets and Insurance ads up!

rominl

iTrader: (4)

yeah, 3.9x is easy to find, gs3 has that too so you have a lot of choices. if you don't care about lsd at all it's not a bad choice. and actually, if you have 20s, i think the 3.92 is a better choice

Swainbuilt

iTrader: (3)

Yeah, but you can get them with LSD. It may even be more cost efective to by the diff just to use the LSD in your original GS400 Diff.

DaveGS4

iTrader: (2)

There isn't one in the GS400 (or any 2nd gen GS) as an OEM option. Stick with your idea on the SC diff to get the LSD.

chuckb

do all SCs have LSDs?

SCV8

None of the SCs had LSD units.

rominl

iTrader: (4)

correct me if i am wrong, but only SOME is300 has the torsen lsd. and since 05 they are gone for good too. i feel so special about my is300 5 speed with lsd

chuckb

so, you gonna make it fast?