is limited slip, Posi? i have a 2004 slt quad cab. i do brake stands and only one tire spins. The dealer told me that limted slip is posi.

 

No, posi is full-time two wheel power, where as limited slip [in theory... people on here will detest the quality of the factory Limited Slip] one wheel engages after the other slips, to create a temp posi, until both wheels have traction again, then is disengages.

 

Really? Granted, I'm not exactly a GM expert, but I thought Posi-traction was simply the GM marketing name for their limited slip differential. Since it was used on so many every-day street cars I really never thought it was a locker.

I don't know what name the Dodge guys had (torque-loc?) for their limited slip diff. back in the day (does GM still use the old Posi-trac name?). Ford used to call their LSD 'Trac-Loc' and as I Ford guy I would get frustrated when people called it 'posi'. I knew they were just using the word in the same way people say 'Kleenex' instead of 'Tissue' - it's just become a common enough word that it's become non-brand specific.

Almost every automaker has some type of LSD, although I don't think many of them use the fancy names anymore. Just like automatic transmissions had names instead of models in the '70s but don't now. Torqueflight anybody?

As far as I know, almost all production LSDs are non-lockers. The only people who went with Lockers were serious drag racers or off-roaders, and the guys who have them will tell you they have their own set of drawbacks on the street. I'm talking about things like Detroit locker, Air-Locker, a spool, or one of the new electronic lockers.

So, uh, after that long-winded reply my comment is that I believe 'posi' is just a clutch type LSD, not a full-time locker.

 

Look on the sticker in the glove box. It is the best way to tell if you have LSD and its easier on the equipment.

 

very upsetting, going to have to get a true posi, i cant stand this one wheel brake stands.

 

like zelatore said, posi's arent really true lockers. they usually lock under power, but still allow the axles to spin independantly when not under power for turning and what not.

 

sorry i ment lockers in that last post.