Did you get the whole pumpkin direct replacement?? Can you point me in the right direction to purchase one of these? Thanks

 

Yes, got the whole pumpkin included. The existing pieces all bolt up to the replacement rear end. Great place to find them would be at a junk yard and you can ask for the year, make that the rear end is off of. Not sure if the GS300 uses a 3.92 rear though, if so that could be another choice to select from. The only rear end that I am not sure it will fit is the IS300. There is an optional LSD for the IS300 also, and if that fits, could be another option to use. Here's some info from other forum members that maby be useful

https://www.clublexus.com/forums/sho...end+gear+ratio

https://www.clublexus.com/forums/sho...end+gear+ratio

The 95-97 LS400 has a 3.62 gear ratio.

98+ LS400s have a 3.26 ratio.

92-97 SC300
6 cyl, AT (4.27 ratio)
6 cyl, MT (4.08 ratio)

98-00 SC300
6 cyl, AT (4.27 ratio)

92-96 SC400
8 cyl (3.92 ratio)

97-00 SC400
8 cyl (3.266 ratio)

92-96 MKIV Supra

w/o turbo; (4.27 ratio) Limited Slip
w/o turbo; (4.27 ratio)
w/turbo, MT (3.133 ratio) Limited Slip
w/turbo, AT (3.769 ratio) Limited Slip

97-98 MKIV Supra
w/o turbo; (4.08 ratio) Limited Slip
w/o turbo; (4.08 ratio)
w/turbo, MT (3.133 ratio) Limited Slip
w/turbo, AT (3.769 ratio)
w/turbo, AT (3.769 ratio) Limited Slip

 

Wow - thanks for all the great info!!

 

http://cgi.ebay.com/ebaymotors/ws/eB...category=33731

 

"THIS IS A LIMITED SLIP DIFFERENTIAL FROM A 1999 GS300. IT HAS ABOUT 40K MILES. SHIPPING WILL BETWEEN $75 AND $150 IN THE LOWER 48 STATES. "


ya, ok. LSD from a GS3

 

some people they don't understand what's rear end and what's lsd. they might freak out when you talk about lsd inside a rear end

 

I emailed those guys about that diff a week ago asking if it truly was a LSD carrier (don't know how it could be) and they never responded.

 

id read over on is300.net that the IS rear end could be swapped with the GS so that might be a possibilitiy as well though i don't know if they've tried it.

 

All Lexus GS, SC and LS models came with open differentials. An open differential applies torque to both tires until traction is lost to one tire, at that point all the torque goes to the tire with the least traction. Under certain very rare conditions you can spin both tires with an open differential... but from a performance driving aspect or maximum traction from a stand still you want some kind of limited slip (LSD)

LSD is typically accomplished with either a clutch that connects both axles or a special gear pack that applies more torque to the tire with the MOST traction. On some traction control programs including the Lexus TRAC system the computer will apply the brakes to the tire loosing traction this transmits torque to the tire with traction and thereby creates an LSD function with an open differential.

From the www.lexus.com website:

Traction Control (TRAC):

TRAC senses the onset of wheelspin, then selectively applies the brakes and automatically transfers power to the driving wheel with better grip. TRAC works in conjunction with Vehicle Stability Control (VSC) [1]. VSC senses the onset of a loss of traction in a turn and orchestrates the brakes and throttle to help keep the driver on track.

It looks like TRAC was introduced on the 2001 LS430 and then added to the GS430 in 2002. I have seen a MB S600 that turns 11 second 1/4 mile passes at over 120 mph, cut a 1.6 second 60ft time with an open differential and the Mercedes TRAC equivilant. Impressive to say the least.

 

very nice info there, well written

question about the s600. i thnk you are talking about the silver s600 with the renntech chip. how does the differential come into play? and cut 1.6 sec?

 

I thought all GS430 were EXACTLY the same as far as mechanical/electrical stuff?

and BTW-my VSC sucks. it feels like everything just shuts down when it kicks in. very dangerous if you are pulling into traffic when it decides to "help"

 

Yes, that is the S600 that I am talking about owned by Ben Treynor. Mercedes has developed their "trac" system so well that these excellent 60fts are possible. Again, by using the brake on the tire loosing traction a standard open differential will power the opposite tire. The important thing for performance is that the traction control not be so intrusive as to shut the car down at the first hint of spin.

 

I am just going off the Lexus site library. Check to see if your 01 GS430 has the TRAC or not. And yes, the Lexus traction control sucks for performance. It is also arguably dangerous in certain situation where it kills power on a small amount of spin and oncoming traffic is NOT waiting

 

Hello everyone......

I tried doing as much research as possible in the forums before posting the following questions. I would really appreciate some feedback from CL members who have LSD mods as this is the last mod I will be making for some time.

1. Before I purchase the Supra Torsen LSD, how bad is the rev limiter issue with the 3.76 unit? I'm rolling on 20X9.5s in back. Am I going to get severe tire spin and rev limiter issues? Does the rev limiter issue occur regardless if you use e-shift or not? How does leaving the VSC on or off affect this issue? I always leave the VSC off unless I'm in the rain which isn't very often.

2. Won't the 3.92 set up cause even worse rev limiter problems? Is it correct to assume that folks with rev limiter issues are simply just rolling on too small wheels/tires? My wheels barely light up when I launch my car, is it possible that I will be OK with the 3.92 unit? FYI, I have no aftermarket suspension mods.

3. The overall consensus seems to be that the Supra 3.76 unit (while limiting overall top speed) is better for launching or "off the line" torque vs. the TRD kit. The Supra install is also much easier and is a major reason why I am leaning toward the Supra unit. I also dont care about driving more than 130mph and just want more launching power. Comments on Supra vs. TRD?

4. Lastly, any general comments on gas mileage after a LSD mod? With the PI TQ and 20s I get terrible gas mileage.

thanks

 

some good questions here, so here are my 2 cents

1) i don't have any rev limiter problem with 3.76 at all. in fact, unless you have forced induction, i don't think you should have any issue with the 3.76. i have had 3.76 on my car for a while and never ever hit rev limiter yet.

2) i have 20x10 in the back for your reference. with and without vsc off i still don't have problem. the only thing with vsc on is that if it from stop, the tires will chirp for a while and then the computer will cut power. but it seems like it doesn't do it as bad if i were with the stock diff

3) using eshift or not the car shifts the same. of course, if i hold the gear it will bounce on the limter

4) yes with 3.92 the traction problem off the line will get worse, that's for sure

5) when i were on stock 17s, i could chirp the tires. then i changed to 19s and could hardly chirp anymore. then i got 20s and it was about the same. and then now i have tc and 3.76 lsd and i can chirp at wheel

6) i don't think the 3.76 is only good for launching. it also makes the car rev up faster and harder and get you into the next gear faster. so it helps you gain speed at all range. from stop you actually have to be careful on traction. if you power brake the car like what what you doing now with the stock gear, you probably find yourself spinning rubber at the light

7) to be honest, the lsd part is good for handling,but unless you push the car really hard, it's not going to help you all the time. the trd unit is just an lsd, so it won't help you on accel at all. the supra tt unit has both the gear ratio AND the lsd, so imho it's a better buy, especailly if you don't have FI

8) it must be weird... coz' i noticed gas mileage drop when i changed to 19s/20s, but with the tc and the supra lsd, i don't really see much degrade in my gas mileage..... it's a bit worse, maybe 1 to 2mpg at most i say, but it's nothing dramatic