LS' don't come with LSD's and as far as i know nobody on the forum has gone around to making one fit.

 

dont forget the guy that did the supra swap.

 

i peel out alot. ask LIcelsior. he sees me doing burnouts, peel outs, heavy acceleration.

 

No your right, but that's one of my future plans along with Lextreme forged pistons/forged rods and a Bullet Australia 1UZ supercharger kit.

 

in the rain.

 

Ah but see, my car too peels out in the rain, quite a bit actually

 

91 ls w 236000mi, Mich tires, no trac control, spins better than when I baught it w/109000mi. good tune up, hi grade synth lubs in trans and crank(Schaeffer Oil)w/Sea Foam clean out. Only on asphalt and no smoke, the sounds are good.

 

Pure is correct... no LS came with LSD. That said MOST will become LSD!

The Toyota/Lexus differential on our cars will become worn over time. This creates enough internal friction to cause LSD action in a straight line.

Most think that differential power only one tire because only one will spin when traction is lost. Truth is differentials power both tires. It is only when one tire looses traction that ALL the torque is routed to that side.

With our differentials the case/spyder gear interface friction increases as the mileage increases. This friction is enough to keep both tires powered even when traction is lost. This only happens in a straight line because if you are turning you are turning the spyder gears and the dreaded one tire smoker re-appears.

 

this is why you can do a 2 wheel burnout (though mostly with 1 wheel smoking) with an LS.

 

The reason for my post on how the stock open diffs become LSDs is through trying to install an 3.77 (3.769) LSD from a 1998 Supra TT auto. I ordered it from an honest Supra owner that was CERTAIN it was an LSD (they were optional on 96-98 Supra TT automatics). When it arrived I pulled my stock 3.266 diff assembly and tried to fit the Supra. As you know the 98-00 LS has the 4 point diff mounting just like the Supra (90-97 have the 3 point mounting and are not interchangeable).

The 2 bolts on the diff back cover did not line up with my LS so I pulled the cover from the Supra diff to exhange and to my SHOCK and HORROR it was a conventional open diff

I took me 1 full week of discussion and proving with the guy I bought it from till he finally agreed and refunded my money.

That experience and the proof in pictures of other Lexus sedans both LS and SCs that would spin both tires lead me to the conclusion I describe above on how a stock diff becomes a LSD.

 

FYI

The GS400 will accept a gearing change without affecting its speedometer/odometer reading. Apparently, the GS uses the actual tire speed (by ABS sensors?) to calculate vehicle speed.

I do NOT know if the LS does this or if the LS uses a convention transmission output sensor for speedometer signalling.

If the LS uses conventional speedometer signalling the readings will be altered if the gearing is changed. This is not the case with the GS. With the GS the speedometer stays accurate BUT the ECU reads a different RPM and reduces the factory speed limiter from 149mph to about 130mph.

So, any 98-00 LS should accept a Supra/GS style 4 point differential assembly as a bolt in. What it does to the speedo and top speed are unknown to me. From a mechanical standpoint it is straightforward and relatively easy to install an LSD on these year LS400s. For earlier cars with the 3 point attachment housings the open diff internals would need to be swapped out with LSD internals. This is a much more involved and potentially problematic requirement $$$

 

my 92 with 139450 miles. engine light with both knock sensors not working.
from a dead stop i floored it and the tires barked a few times. tranny in eco mode
My intake has been cleaned...has original fuel filter...original plug wires.original timing belt.
so im happy