ScottURnot

iTrader: (33)

Now that I have finally located a LSD for my SC400 I am rekindling this thread. Surely someone can tell me how to correct the speedometer once the LSD is installed. Not only will this make the speedo register faster than you are going, but in addition this is going to rack up more miles on the cars odometer which is uncool. Does any one have a fix? What is this “yellow box” and where would I get it?

verylost

Have you tried searching?

0l33l

iTrader: (3)

Isn't the speed sensor on the front wheels?

supravvti98

It will work. We have the same casing, so just switched out the internals. If that is the case, I guess you can just do a direct bolt on. He said the speedo will be the same. LMK>still for sale.

ScottURnot

iTrader: (33)

I dont know, is it? That would sure be easy if it was, every car/truck I have owned up to this one had the speedo pick up in the transmision via gear/sender. Anyone know for sure LMK

0l33l

iTrader: (3)

That would explain why it doesn't effect if you change out the LSD. I've read somewere, but I can't find it in the search

/Aerostar\

iTrader: (2)

Nope, those would be the ABS sensors. I am 99% sure the speed sensors are in the tranny/rear

0l33l

iTrader: (3)

maybe

ScottURnot

iTrader: (33)

Well a easy way to find out is jack the rear up and drop it in gear if the speedo goes then its in the Tranny if not its up front. I'll try to do this tomorrow and Ill let you know. If it is in the tranny I still have a dilemma, If I change the gears how do I correct the speedo?

gadgetSC

You will find 2 speed sensors on your tranny...one on each side of the tail section.




gadgetSC-t

ScottURnot

iTrader: (33)

So is there some way of compensating for different rear end gears?

/Aerostar\

iTrader: (2)

Wait, of course its in the rear!! Think about it, whenever any of these cars are dyno'ed the speedo works fine

ScottURnot

iTrader: (33)

Now that we have that settled, Back to the question
How can I change my rear-end gear ratio and correct the speedometer?
Has any one done this? I have tried searching, no luck.

moua4c

there is a device call a yellow box, change the speedo signal.. speedo will look the same after the diff change over, however your actual speed will be different.

I gain about 5 mph more with the lower gear ratio diff however my spedo shows the same speed as before. Reason i know is because there is this speed check thing on the street, it shows your speed. before I change over , the machine shows the same speed as on the speedo. after change over, machine shows 5mph more then on the speedo.

UpInTheLex

iTrader: (5)

I would think this thread would be in the suspension/handling section of the forum, nonetheless...

You need a lsd from an auto tt supra 94-98. They all had lsd's untill 97-98, where it was an option. Mine is a helical type from a 94TT. I swapped the entire diff housing. It's a bolt on project where you don't have to rebuild the rear end, and mic and set everything up. it was a couple hours job in the driveway. unbolt the driveshaft/ both axles/ and take out the mounts that hold it in, and reverse to install it. It's easy and changes the driveability dramatically.

By the way, there are no speed sensors in the diff, there are no abs sensors...I don't know exactly what you all were talking about cos i didn't take the time to read. just get a LSD from automatic mkiv supra and bolt it in, everything works perfectly.