What is the difference between a limited slip differential and a posi rear end?

Answer 1

A positrac differential (rear end) distributes equal power to both rear wheels at the same time while a limited slip differential only supplies power to one rear wheel while the other only moves when the car is in motion.

Answer 2

A true Posi rear end transfers power from the rear end, or third member via mechanical means to each rear wheel equally. The rear wheel both pull all the time. A limited slip rear end has one rear wheel engaged all the time, and the instant that rear wheel starts to slip, power is transferred to the other wheel to keep you from losing control, or spinning out. Some of the limited slips are electronically controlled, some are mechanically controlled. If you do not have a Posi, or limited slip, and you lay rubber, you will only leave tread marks with one tire. With a Posi, or limited slip you will see a patch of rubber with both rear tires. Posi traction on new cars has not been available since the the mid seventy's. it was about 1974 when the anti spin rear ends started appearing on the new cars. The early anti spins were not as popular as the Posi rear ends to the racers and hot rodders. But now for street use the anti spin works great. By the way, Posi was short for Positive Locking Rear End, or Differential. Hope this helps.

Answer 3

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RE:
What is the difference between a limited slip differential and a posi rear end?

Answer 4

Posi Rear End

Answer 5

The name "posi" originally was used by GM as the brand name for its original equipment limited-slip differential. The full name was "Posi-Trac." After a time, "posi" became a popular name for limited-slip differentials of any origin. This same device, first available in Chrysler products in 1957 (or thereabouts) was called "Sure Grip." The Ford edition was called "Traction-Lok." "Twin-Grip" was AMC's version.

If your Z28 has a posi, be forewarned that the same benefit of equal (more or less) traction on both drive wheels means that when traction is lost, both drive wheels spin. Practice your skid-recovery skills before having a very unpleasant experience on wet or snowy roads.

Incidently, limited-slip differentials are also available on front-wheel drive cars.

Answer 6

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PosiTraction was, indeed, a GM phrase. It's nothing more than a sales name given for a limited slip differential. If you were a buyer, which would sound more appealing: "Yeah, this has a limited slip differential" or "This has...POSITRACTION!" The first one, people would say "this would allow you to slip?" and you would have to explain to a housewife what an LSD does. The second sounds like Positive Traction. Ford calls theirs Trac-Lok, Dodge uses the Sure Grip moniker.

Answer 7

A posi-trac has torque to both wheels all the time. A limited slip becomes a posi-trac when get in a place where your wheels are going to spin. When you get in mud or ice your RR wheel will start to spin while LR does nothing. With posi-trac they both will spin. With LS, after yourRR starts to spin, the LR will do the same. The limited slip came in after everyone saw how dangerous the posi-trac is on wet pavement or ice. With posi-trac, both wheels are pulling constantly. This will cause a tailspin when you gun it on wet pavement. Hope this helps.

Answer 8

I'm fairly confident that they're the same thing. I believe it was GM that named their limited slip "Posi traction" on their cars.

Answer 9

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Answer 10

ROFL boy your girls are nothing like in my day when theyd just faint in front of a mechanic and get him to solve their troubles.