how can i tell if a rear end is a posi rear end?

Question

what does a posi rear end do different than a regular rear end?

Answer 1

4 ways:

1. Jack it up and spin one wheel, if the other spins the same direction you have it. (not always accurate)

2. Check for a tag on the differential.

3. Burn out. check for even tread patches.

4. In a large open area, preferably dirt or loose paving, turn left in a tight circle and continue. Listen for your inside(drivers side) wheel skipping. If it is skipping you have posi/limited slip.

Answer 2

Posi rear ends try to make both wheels/axles turn the same speed especially under load. Most have a tag bolted to the cover plate which indicates gear ration and positraction. No tag could be one lost if someone took it off or no posi. A second choice is turn the steering wheel when parked in a large empty parking lot and drive in circles apply more power slowly as you go. With posi there will quickly be a lot of tire squeelling as the tires slip. Without posi one can drive in circles pretty fast without squeeling.

Answer 3

posi rear end both tires will spin at the same interval, limited slip rear end,s is when 1 tire losses traction the other tire automatically starts turning and vise-a-versa. To check if its a posi,, put the wheels on hard ground such as asphalt or concrete ,,punch it,and spin the tires. if you only get 1 line of tire marks it,s a limited slip. If both wheels leave the same length of marks it,s a posi.

Answer 4

The main advantage of a limited slip differential is found by considering the case of a standard differential where one wheel has no contact with the ground at all. In such a case, the contacting wheel will remain stationary, and the non-contacting wheel will rotate freely– the torque transmitted will be equal at both wheels, but will not exceed the threshold of torque needed to move the vehicle, thus the vehicle will remain stationary. In everyday use on typical roads, such a situation is very unlikely, and so a normal differential suffices. For more demanding use however, such as driving off-road, or for high performance vehicles, such a state of affairs is undesirable, and the LSD can be employed to deal with it. By limiting the velocity difference between a pair of driven wheels, useful torque can be transmitted as long as there is some friction available on at least one of the wheels.

Answer 5

Oh this is fun. Here's what you do:

SAFELY, floor the gas pedal and lay rubber. If you get two mostly even tread marks (one from each tire), you're good!

If you're looking at parts off the car it's harder to tell, a lot harder. Takes a trained eye. You should do a web search for images of rear diff. housings (cover removed) with posi installed for comparison.

Answer 6

In a positraction rear end, BOTH wheels push the car, not just one drive wheel. Jack up the rear end and turn one wheel. If they both turn in the same direcrion, it's a posi.