My question is the last couple of times I tried to pull something only my right rear wheel spins.I check my window tag and they charged me for rear anti dif.Both times I was on uneven ground would that cause this or is something wrong?Shouldn't both tires spin?

 

To know for sure , you would need to pull the diff. cover , to look for clutches .
They are limited slip , so under some conditions , that can happen , they are limited so that going around a corner / turning , the wheels can rotate at different RPMs .
But they may have put in the wrong diff.
I was under the impression , that all were limited slip .

 

I may be corrected on this, but with a LSD, both tires will spin if the traction is equal. If one is on ice and the other is on pavement, the pavement will get the power. If I lift one rear tire off the ground, the one on the ground will pull my truck off the wood blocks, but the one in the air will not spin. Only with a locking diff will both tires spin, even if one is in the air.
A test is to raise both tires off and spin one by hand, with a LSD, the other tire will spin in the same direction, with a open diff, the other tire will spin in the opposite direction.
I think your 2006 diff does not have the traditional clutch pack. If it does, they may have been arranged from the factory in a way where your LSD may be more of a open. That can be changed.

 

The 06 has a worm type rearend not the clutches.It is a amm rearend.But I thought with the anti spin diff that meant both tires would spin once you apllied power.
Thanks

 

An easy test to use to find out.

Wet road. Nail the go peddle. If your tires spin and you fish tail quickly, you have a locking diff. If your tire spins and you stay in a straight line, you have an open diff.

Just be careful when testing.

 

The Torsion anti-spin diff will spin the opposite tire the opposite direction, like an open differential. I verified that at home myself.

Try putting one wheel on the dirt shoulder and the other on pavement and stomp on the go pedal. You should get a nice bark from the tire on the road as it hooks up. I've read (here I think) that the torsion anti-spin gives five times as much torque to the tire with more traction than to the one with less traction. If you have no or very little traction on one wheel, five times zero is still zero to the one with better traction. In this case you're supposed to apply the brake or parking brake somewhat to fool the beast.

The ultimate test is to pop the cover and look...

 

Thanks I will try that.I thought with the anti diff once one tire spins the other one would kick in.I have left posi marks before,just last couple of time towing around the yard only one tire spins and I was getting on it pretty hard and still wouldn't kick in posi.

 

Next time that happens hold the brakes. The tire could be spinning too fast for the system to lockup the other side.

MikeyB

 

To test put the truck in reverse and back up about 10 feet. This will lock the rear diff if is a true locking rear. After this try a powerbrake and spin the wheels. You should have 2 burn marks on the pavement.

 

It is a standard so not so easy to aply the brake,but I have left posi marks before I was just wondering if something broke because the last couple of time moving stuff around the yard only one tire spins and I tried everything except the brake method.Slow ,hard ,backing up.I also was on uneven ground.Anyway Hey I used to live in wilmington Oh,work for Airbone Express.

 

Airborne Express!! I do alot of crating for them.

 

listen to jumper....everything he said is true!!!! everytime these rearend posts come up im amazed at how misunderstood the different types of diffs are....assuming you have a 3rd gen, then you have a torsion type limited slip....limited slip means that it will NOT lock up. With these type of diffs, if you find yourself spinning one tire, incrimentally increase the parking brake pressure until the spinning tire stops. I have found the AAM LSD to be very effective if driven correctly, tires speed in not your friend with a torsion type diff!!!