I put the rear end up on jack stands today to see if i have a posi and i have no clue what im doing When i spin the yoke, both tires spin When i spin 1 tire, the other tire spins the opposite way??? What?
Can you explain please? From what i have learned (not much) An open differential is one that applys the same amount of torque to each wheel. So will both tires spin?
If you do a little research, you'll find this type of information is all over the Internet. http://auto.howstuffworks.com/differential2.htm
open diff = one-wheel peel. when both tires are off the ground, and you turn one, the other will spin the opposite way. Most posi setups will also. A spooled setup will have the opposite tire spin the same way as the one you are turning. most posis are limited slip, so they act "open" until you put lots of torque on them. So, for example, my truck has a cluch-type posi, and when off the ground, I spin one wheel the other goes backwards. But if I leave one wheel on the ground and spin the lifted one with a torque bar, it will try to move the truck in the direction I am spinning the lifted wheel, meaning the one on the ground is binding at the posi and trying to spin WITH the lifted one. Hope that makes sense.
Uh oh Scooper your going to confuse him. A clutch type posi like the 8" wont spin the wheels in different directions on the hoist. The axles are locked together through loaded clutch packs and take quite a bit of torque to turn only one axle against the clutch pressure. They will turn the same direction on a hoist in neutral and neither wheel can be turned on the hoist in park. An open diff you can turn the axles on the hoist in park and the wheels go opposite directions due to how the spider gears walk around each other. An 8" trac loc you cant turn the wheels in park on the hoist. These rules dont apply to other posi type diffs and lockers with different style carriers. Our 8 and 9 inch diffs are a clutch pack style loaded by spring pressure. Our posi's dont act open until torque is applied Scooper. Thats backwards. The axles are locked together through the clutch pack pressure and it takes a torque difference on the axles to slip the clutch pack like going around a corner.
didnt I hear you say this before...... I admit I'm guilty of using the GM term it just rolls off the tongue better than trac loc. Even at work everyone calls it Posi. Our Chrysler terminology is Posi , posi trac or limited slip in the newer literature. Even the guys who build the vehicles cant call it one thing.
the reason both tires turned the same direction when you turned the yoke is the resistance on both sided of the differental gears is the same so it doesnt differentiate and drives both tires foward. if you blocked one tire from turning the other would turn twice as fast as did befor as you turn the yoke the same speed as before. if you had a limited slip it would difficult but not impossible to turn the yoke. you would have to apply enough pressure to overcome the clutches in the limited slip
I just did an inspection on my truck which has that Chrysler limited slip, and it does this. Works like an open until torque is applied to it. I assumed it was a clutch type.
My 9 inch Traction-Loc has spring loaded clutch packs and the clutches are always engaged as long as the car is going straight. Once one of your rear tires has to turn faster than the other, as in cornering, the clutches will dis-engage. Then when you're going straight again the clutches, once again will engage, and the power is going to both rear tires. Both my rear tires are locked together when you spin one of them on jack stands.
its either an open or a torsen type posi. the torsen doenst use spider/side gears in the differental. it uses worm gears that use fluid pumping through the worm gears to create a resistance to prevent the open differental effect. the most common torsen on the market is detroit lockers true track right no. i have never see one in a dodge truck stock. i suspect that you have an open diff or your posi is worn out.
