SUPERSTEVE9219

Well somebody asked me the other day if my car had posi traction on my car, I didn't really have a idea of what they were talking about and they told me that without positraction that only one wheel would burn out if I floored the car. They told me I could tell if I had it if I jacked up one wheel and spun it, if I was able to I didnt have positraction. I did jack up one wheel and I was able to spin it.

Could someone explain this to me? Is this all true? I know that differencials allow the wheels to spin at different speeds, but I didnt know it would cause only one wheel burnouts.[sm=smiley24.gif]

Aussie66Fastback

have a look at the current post running on this topic

https://mustangforums.com/m_4474398/mpage_1/key_/tm.htm

69thunder

Very few mustangs have posi unless modified.

TexasAxMan

Try this, jack up both rear wheels, spin one tire. The other one will either spin the same direction (posi) or the opposite direction (non-posi).

BTW, get ready, there are a lot of guys on here that are **** about the use of the word posi or positraction when referring to a Ford product. Technically it is a GM term, the proper Ford term is Trac-Loc. I say posi though and a lot of others do too.

Daze

SUPERSTEVE9219

What you are referring to is a limited slip differential. Basickly to get traction from both wheels. In a street driven or circle track car, you need a system that will not slip on the strate of way especially when power is applied and will slip on the curves so that the inside wheel of any given turn will spin slowr sense it has less distance to cover, hence the term "limiited" slip.

I am a card carrying member and on the board of trustees of the **** group. [8D] For the record limited slip is the ONLY "accurate" universal term. Posi is GM, Trac-Loc is Ford and Sure-Grip is MoPar. Same breed of cat different name. I would say that of those that know the difference the split is about 50/50 between those that choose to use the misguided but universally understood GM term and those that pay there Fords the respect they are do and use the Ford term when referring to a Ford limited slip differential. Basically if you are talking about a Ford to Ford people use the term Trac-loc. If you want to be universally understood, and respectful to brand use the term limited slip.

JMD

Watch My Cousin Vinny....

After watching that movie even my wife understands what a limited slip does!

67mustang302

LOL, I was gonna mention something about the use of Posi as well, but.....

There's limited slip types, either clutch or non clutch types, the non clutch type limited slips are generally using worm gears, and there there are lockers that use some sort of mechanism of one type or another to either lock both axles together so they turn at the same rate, and at certain times unlock it so it's like a standard open differential. There are also electronic lockers, which are sometimes a limited slip and the driver has a button he presses to electronically engage a locker.

Any type of performance setup and you'll want a LSD or locker of some sort.

Starfury

Worm gear and lockerdiffs are not limited slip, as there are no clutches to slip. Worm gears transfer power instantaneously through the gear setup, lockers are either locked or unlocked, no slipping involved at all.

blue66mustang

So we can create our very own new name for this :

"Binary Loc"... It's either on or it's off.