Okay this is basicly what happened. I went to a local shop to get my new clutch and flywheel installed. Everything was fine. They took apart the car, took off the tranny, took off the old clutch, slapped on the new one. Then this is where things get a little suspicious. They took something off of my transmission. Something that connected to the LEFT side of that hole that connects the transmission to the axle. Well, that "thing" is actually supposed to connect to the ATTS which is then connected to the left axle. I'm trying to figure out if the LSD was jacked and replaced by a regular differential. Is that possible? If so how can I tell?

Well basicly, I'd like to know one thing. How can I find out if my LSD is still in there? I hear that when you jack up the car and spin one wheel while it is in gear the other should spin in the opposite direction. But when it's not in gear, they should spin in the same direction. I tested this out on my friend's LSD MR2 and it did this. I also tested this on my friends F22 Accord and it didn't do this. The F22 (which has no LSD), spun in opposite directions when in gear, just like the MR2 did, but did not spin together at all when it was NOT in gear. My prelude did the same thing as the F22 did. Now I'm worried.

I also wanted to note that someone I knew told me that the ATTS is the reason for this. But I don't know about that because I tested this while the car was off. So the ATTS shouldn't even be active.

What do you think peoples? Do I have to go back to the shop and lay some smack down?

 

Type SH does not have LSD. The only Prelude to have LSD stock was the JDM Prelude SiR.

 

Laying down the smack down won't be necessary since there was no LSD to begin with. You have ATTS (Active Torque Transfer System), not to be confused in anyway with an LSD unit. The only 5th gen that came with LSD was made in Japan, tranny code: M2Z4.

 

Isn't that M2B4?

 

the sh does not have LSD. it has an open differential, yes, but not LSD. Your set-up is fine. There is a small piece that connects the atts to the tranny, if your car runs and moves, then it is fine.

 

While we're on the subject, what is the proper way to tell if a car has a LSD?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BrokeLude &raquo;</TD></TR><TR><TD CLASS="quote">Isn't that M2B4?</TD></TR></TABLE>

The M2B4 was offered as an option in the 4th gen Preludes in Japan. The M2Z4 is from the 5th gens. Both trannys have LSD.

 

Hey, I learned something today. Thanks dude...

 

1 - is your ATTS light in the dash on?

2 - get under the car and look. from the driver side to pass side this is what you should see.

half shaft
ATTS Unit (big annoying box)
then there is a small shaft that goes into the ATTS unit and then into the tranny. i dont remember if you can see it or not when its all connected.
pass side half shaft.

really if the ATTS light isnt on then i wouldnt worry about it.

next time just change it yourself and avoid all of these worries.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by miff &raquo;</TD></TR><TR><TD CLASS="quote">Type SH does not have LSD. The only Prelude to have LSD stock was the JDM Prelude SiR.</TD></TR></TABLE>

Are you sure? Because I remember when the shop had my tranny out on the floor they looked at it and they said, "Something something LSD." And I asked them, "Does this car have LSD?" And they said, "yeah".

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by caLiH22A &raquo;</TD></TR><TR><TD CLASS="quote">Laying down the smack down won't be necessary since there was no LSD to begin with. You have ATTS (Active Torque Transfer System), not to be confused in anyway with an LSD unit. The only 5th gen that came with LSD was made in Japan, tranny code: M2Z4.</TD></TR></TABLE>

Is there any possibility that LSD can be equipped on a car at the same time that there is ATTS?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Shakes &raquo;</TD></TR><TR><TD CLASS="quote">1 - is your ATTS light in the dash on?

2 - get under the car and look. from the driver side to pass side this is what you should see.

half shaft
ATTS Unit (big annoying box)
then there is a small shaft that goes into the ATTS unit and then into the tranny. i dont remember if you can see it or not when its all connected.
pass side half shaft.

really if the ATTS light isnt on then i wouldnt worry about it.

next time just change it yourself and avoid all of these worries.</TD></TR></TABLE>

Well.... the ATTS light isn't on. But I can't look under the car right now, I'm kinda outta state.

 

no ATTS and LSD do not work together. The ATTS unit makes it impossible.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xxxdjfrostxxx &raquo;</TD></TR><TR><TD CLASS="quote">

Are you sure? Because I remember when the shop had my tranny out on the floor they looked at it and they said, "Something something LSD." And I asked them, "Does this car have LSD?" And they said, "yeah".
</TD></TR></TABLE>

positive. the ATTS probably gets confused with LSD by people that aren't familiar with preludes though....

 

the way to actually tell if its an lsd is to drop the tranny, and if you can see straight through the diff, its LSD w00t. Otherwise you gotta trust the sticker and the giant freakin ATTS thing hangin off the side of your transmission.

 

No way! I had LSD + ATTS + AWD on my prelude.

Guys, stop your lying.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98TypeSH &raquo;</TD></TR><TR><TD CLASS="quote">the way to actually tell if its an lsd is to drop the tranny, and if you can see straight through the diff, its LSD w00t. Otherwise you gotta trust the sticker and the giant freakin ATTS thing hangin off the side of your transmission. </TD></TR></TABLE>

Whoa, is the differential located right where the tranny hooks up to the axle? Because I do remember looking through it and you can see right through it. Are you guys SURE for SURE SURE that Prelude SH's don't come with LSD?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xxxdjfrostxxx &raquo;</TD></TR><TR><TD CLASS="quote">

Are you guys SURE for SURE SURE that Prelude SH's don't come with LSD?</TD></TR></TABLE>

100% SURE

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xxxdjfrostxxx &raquo;</TD></TR><TR><TD CLASS="quote">Okay this is basicly what happened. I went to a local shop to get my new clutch and flywheel installed. Everything was fine. They took apart the car, took off the tranny, took off the old clutch, slapped on the new one. Then this is where things get a little suspicious. They took something off of my transmission. Something that connected to the LEFT side of that hole that connects the transmission to the axle. Well, that "thing" is actually supposed to connect to the ATTS which is then connected to the left axle. I'm trying to figure out if the LSD was jacked and replaced by a regular differential. Is that possible? If so how can I tell?

Well basicly, I'd like to know one thing. How can I find out if my LSD is still in there? I hear that when you jack up the car and spin one wheel while it is in gear the other should spin in the opposite direction. But when it's not in gear, they should spin in the same direction. I tested this out on my friend's LSD MR2 and it did this. I also tested this on my friends F22 Accord and it didn't do this. The F22 (which has no LSD), spun in opposite directions when in gear, just like the MR2 did, but did not spin together at all when it was NOT in gear. My prelude did the same thing as the F22 did. Now I'm worried.

I also wanted to note that someone I knew told me that the ATTS is the reason for this. But I don't know about that because I tested this while the car was off. So the ATTS shouldn't even be active.

What do you think peoples? Do I have to go back to the shop and lay some

smack down?</TD></TR></TABLE>

You are a moron, SH's are open diff period always have been, no one is going to take your SH transmission components. Further more LSD cannot work in a SH tranny because it prevents ATTS from routing the power between the two wheels. while cornering

 

so where can i find the sticker on the tranny.. does anyoen have a picture?

to find the M2B4 or the M2Z4

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by esca &raquo;</TD></TR><TR><TD CLASS="quote">so where can i find the sticker on the tranny.. does anyoen have a picture?

to find the M2B4 or the M2Z4</TD></TR></TABLE>

its right next to the flywheel plug, that black thingy that covers the hole, or if u dunno what im talking about, its next to the starter, or if u still dont know what i'm talking about, standing at the front of the car with the hood open, look down at the header/heatshield, then look about a foot to ur left and down a little, and look for letters and numbers, all prelude tranny's start with M (ie m2a4, m2b4, m2u4, etc...)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xxxdjfrostxxx &raquo;</TD></TR><TR><TD CLASS="quote">
Are you guys SURE for SURE SURE that Prelude SH's don't come with LSD?</TD></TR></TABLE>

Holy hell...yes, they're "SURE for SURE SURE" As was stated previously the SH has ATTS, Active Torque Transfer System, which is often misidentified as a LSD. You don't have a LSD, have never had a LSD, and unless you convert to a base tranny WON'T ever have a LSD! The ATTS system basically monitors a number of sensors in the car (steering angle, wheel speed, yaw, etc) and actuates clutches within the ATTS unit to direct power to the outside wheel when cornering, thus improving the handling and feel. Conversely a LSD is just what its name implies a Limited Slip Differential...in other words when one wheel spins a portion of the power will still be directed to the opposite side unlike an open diff where all will be directed to the spinning tire. Both setups have their pros and cons but can't be used in conjunction with each other, it's either one or the other. You're worrying _way_ too much about this...

--Ian...who, to confuse matters, DOES have a LSD in his SH