SRT-4s new LSD

the 2004s SRT-4 are coming with an LSD stock. It is confirmed

what'd an LSD?

Limited Slip Differential

is it the quaife LSD? cuz that was supposed to be aftermarket:confused:

Originally posted by DOHcNEON
Limited Slip Differential

Ah ok, thanks. I'm a little confused though, is limited slip better than posi? You'd think posi would get your off the line quicker...?

That is awesome!!

Positraction, posi, all are just a brand name. Made up by GM. It is just their marketing term for a limited slip differential.

What did you think the difference was, just to clear any misconceptions up;)

Originally posted by Chris
Positraction, posi, all are just a brand name. Made up by GM. It is just their marketing term for a limited slip differential.

What did you think the difference was, just to clear any misconceptions up;)

Hmmm....I thought that with a limited slip differential, as soon as you start to spin the tires, power only goes to one of the wheels. And with posi, I thought you would get botht he tires spinning at the same time. Isn't there a name for this? Cuz my friends 240sx can power brake, but only one tire spins. My other friends trans am can power brake, and both his tires spin. What's the real name for this if those aren't right?

Positracition enables both of your tires spin. I don't know what they call it without it.

Originally posted by violator5spd


Hmmm....I thought that with a limited slip differential, as soon as you start to spin the tires, power only goes to one of the wheels. And with posi, I thought you would get botht he tires spinning at the same time. Isn't there a name for this? Cuz my friends 240sx can power brake, but only one tire spins. My other friends trans am can power brake, and both his tires spin. What's the real name for this if those aren't right?

Your concept of a limited slip differential is what is actually an open differential. Almost all cars use these. In fact, unless it advertises a limited slip differential, its probably an open differential. This routes the power along the path of least resistance. This is unadvantageous for many reasons; under hard acceleration, one wheel will burn out while another gets less power (especially noticeable if one wheel is on ice and another is on pavement. You could get stuck, even if one wheel is on pavement. They are only used because they are cheaper.

A limited slip (or posi), will only let a tire spin faster than another to a certain limit. If one tire spins too fast, then, using a centrifical force activated clutch, or viscous fluid in the diff, it forces the other wheel to spin aswell. This doesnt make both tires spin at the same speed, it just makes them spin relatively close to the same speed. This helps with acceleration, getting unstuck, gettin power down around corners, etc. It costs more than an open diff, though.

Finally, there are lockers. These are only really used on drag racers and off road vehicles. This is when both wheels are forced to spin at the same rate. This way, more power goes to the wheel with traction; the wheel with no traction will spin, but only as fast as the wheel with traction. These are not good for going around corners, as the car will transition from oversteer to understeer a few times while going around the corner, as the inside tire gets traction and loses it.

I'm still confused because I san sit still and spin both my tires, but my friend's 240sx can't. Neither of us have a LSD.

If you are able to unload both of your tires (overpower them simultanously), then, both have a relatively equal amount of traction, and both will spin. Since your Neon is FWD, this is easily possible. The tires do have a lot of weight on them, but there is not much weight shift onto them, like there is on a rwd vehicle. Also, your car does not have that much torque, so no side is being more laden by torque rock (like you see on old muscle cars, rocking from side to side when they hit the throttle)
With the 240SX, the rear wheels are being driven. So, the weight shifts to the back of the car. The weight probably wont shift evenly, so, one tire is given more traction and the other less. So, the tire with less traction will start to be fed more power, and the situation makes itself worse, as it loses traction from spinning. Also, the 240 probably has better tires than your car, so once one grips, the other will lose traction from the torque sent back through the diff.

And all that might be wrong, its a weird situation. But, suffice it to say, complicated things are complicated :P
But knowing the end result is more important anyway.

ok, that makes more sense...thanks

Does anyone know when they plan on releasing a 2004 SRT-4? I don't wanna go buy the 2004 and then have it be obsolete after a few months.:D

They should be out towards the end of this year.

Will the 2004's be available in most Dodge Locations, or just the select few like the 2003's? :jumpie:

I don't know, I am looking into that, but I sure hope that they are. Hell I can get an Evo here in Utah, but if I want an SRT-4 I have to drive all the way to Cali.

How much do you think they will add on to the price of the car with the diff?

id read that the limited slip was aftermarket as well, made by quaife, and they were testing it in the cannonball this year. is it possible to get the lsd put in aftermarket? ive been hearing that mopar is going to offer it for the 03 srt.

I would like to contribute to this post. I've been active in motorsports since the early 70's and have heard different versions of the word 'positraction'. Granted the word positraction may have been trade marked by GM but its the definition of the word that describes the action. 'Posi' as in positive; definate; to set firmly. In the muscle car scene a posi meant that the two axles were 'locked' into place turning at the same rate. When you went around corners the back tires would chirp around the radius of the turn due to the tires unability to turn independently. In the four wheel drive scene the term posi is not used a much and the term 'locking' differential is used. Here are some definitions that I agree with.

Limited Slip Differential: A specially designed differential that not only allows the left and right axles to spin independently, but also has the ability to distribute the power to each axle even if one is slipping due to the loss of traction. A Limited Slip Differential ensures that some torque is always distributed to both wheels, even when one is on a very slipper surface.

Positraction or Locking Differential: A differential that locks the two outputs (axles) together, so there is no differential action giving you maximum traction. Generally used for drag racing where no steering is needed.

My camaro had a 4.11 posi which left twin burn marks and made the rear of the car hop around corners. Needless to say I was changing the rear tires often. :smile:

:bigthumb: THATS THE DEFFINITION I ALWAYS KNEW ABOUT POSI AND LIMITED SLIP

Mopar, Chrysler Group's parts and accessories brand, is launching a complete line of performance upgrades designed to make the sporty Dodge SRT-4 even quicker. In an attempt to cash in on the "import tuner" craze, Chrysler Group's Performance Vehicle Operations (PVO) engineers designed upgrades such as a turbo upgrade, new manifolds, short throw shifter, limited slip differential, and transaxle enhancements. The parts will be available this summer at local Dodge dealers. You can order these parts when you order the car, so in a way even though they are aftermarket parts they will come stock on your new car. You can also buy a SRT-4 and have these parts put on later. So in a way the LSD is both aftermarket and stock. :biggrin: