That LSD picture is torsen type (RMM, Supra). Your TRD LSD is clutch type.

 

Whats the differsnce in trd lsd and rmm lsd as far as performance.I know the gearing is different right?

 

The pic of the whole pumkin (RMM,Supra TT) has 3.76 gears and you can just swap the units out...

The LSD that you bought is just the LSD, you have to install it yourself. The TRD LSD (clutch type) are supposed to be stronger than the RMM,Supra TT (Torsen type) atleast that's what Steve Ganz told me...

The TRD LSD has to be installed by a person who knows what they're doing. Shimming it wrong can put pressure on the bearing and cause wearing and damage to the ring and pinion. I would recomend going to a well known 4 wheel drive shop and having them do the job because they always change and install LSD, Lockers, and ring and pinions.

Either way you made a good decision on getting the LSD...


Aloha

 

Most of my friends favor in Torsen but since TRD chose the clutch type, it must have its reasons. And you can trust products from TRD. The gear ratio is different therefore you will reach red line faster with Torsen and higher rpm at freeway.

Also Torsen type is easier to install since it's bolt on and clutch type you have to do a lot more work.

Both types of LSD attract two different groups of people.

 

Is this the correct picture for the TRD LSD?

I am going to show to my Dealer.. see if they want to deal with it. If not, I'm certainly not going to buy this.. so some shop can fool arround with my car..

 

If anybody remembers the crazy blowout deal Steve had many moths back for LSD at less than $500. Were they the TRD clutch type?

And the new group buy on LSD, were they the Supra torsen type?

I guess my question is, which is cheaper? If I do this I want easy install. Not may shops around my town that I would trust with this.

Overclocker

 

Shin,

YES. This is the TRD LSD.

The different between Torsen and clutch type is, Torsen type is torque bias, so it's partially locked depends on the wheel spin. The clutch type is either fully locked or fully un-locked. If you have higher HP, you definitely need TRD unit. My friend's 700 hp SupraTT can spin the tires even at 3rd gear with Torsen style LSD:eek:

 

My .02 on this Torsen vs Clutch Type LSDs:

Unless you are building a drag monster with upwards of 5,6,7,800 HP, I don't think you really need to worry about blowing up your LSD.

But similar to whatRA said, to each his own.

 

the $500 blow out deal was Supra Torsen Type LSD.
the groupbuy that just ended was TRD clutch type.

I guess I couldn't decide which one to get until I take a ride of both cars. LSD appears to be the hardest decision I'd need to make.

 

ok i am going to ask this one more time:
WHICH LSD COMES AS A COMPLETE PACKAGE (PUMPKIN) AND WHICH ONE COMES AS JUST THE CLUTCHES AND INNARDS!!!! please help!!!!!


Doc

 

Nope..... The Toyota SupraTT(not TRD) auto=3.76, 6-speed=3.21
I believe....
The TRD is an easy install also, Ive seen it done...

 

Supra TT LSD is a complete unit. It is a Torsen/Helical gear type with 3.76 ratio. Installation estimate is about 3 hours.

TRD LSD is the innards (spider and clutch assembly). You reuse the ring gear and pinion gear. It is a 2-way clutch type with stock 3.26 ratio. Installation estimate is about 6 hours.

You can't go wrong with either LSD. Either will greatly reduce wheel spin.

The Supra is more expensive to purchase but cheaper to install and will give you a little more torque/acceleration. Your RPM's will be higher at a given speed which could be a neg. if you do alot of highway driving.

The TRD is cheaper to purchase, but more expensive to install. It can handle more power and will provide torque in extremely low traction situation, i.e. snow/ice.

I chose the TRD. It was the low cost option for me since I did the install myself. It will minimize wheel spin and better snow/ice traction was a benefit for my location.

 

Depends on the dealership. My TRD LSD was installed a while back at Lexus of Serramonte in the Bay Area. They have some knowledgeable master techs.

 

Wait, I thought the RMM lsd provided more accelaration off the line making it better than the trd lsd no?Or am I misundestanding the use of lsd

 

Main purpose of a LSD is to provide bias torque to both rear wheels. The stock open differential provides equal torque to both rear wheels, so if one wheels starts spinning the other wheel gets minimal torque. The LSD will provide more acceleration because you can apply more torque to the rear wheels without spinning/smoking the tires.

The Supra TT/RMM LSD also has a gear ratio of 3.76 that will slightly increase the torque to the rear wheels over the stock 3.26 ratio.