Here's a picture of my 1 week old Ram 1500 that was listed as having Anti-Spin and 3.92 gears on the window sticker. With the truck in this position and in park I can easily spin the left wheel forward with one hand and the right one turns in the opposite direction. If this Diff was locked up with clutches I would think that you could not turn either wheel with the trans in park. With the trans in neutral I would think that both wheels would rotate in the same direction when turning just one.

Here's the sticker info on the axle tube

P68083464AD 3.92
T03UG0821Q1718 16

464AD



http://i812.photobucket.com/albums/z.../Ram_Front.jpg

 

All 3.92s are supposed to be LSD. Mine is I know.

Let the dealer sort it out.

 

It will spin with both tires off the ground.

The differential can be tested without removing the differential case by measuring rotating torque. Make sure brakes are not dragging during this measurement.

1. Place blocks in front and rear of both front wheels.
2. Raise one rear wheel until it is completely off the ground.
3. Engine off, transmission in neutral, and parking brake off.
4. Remove wheel and bolt Torque Check Tool 6790 (1) or equivalent tool to studs.
5. Use torque wrench (2) on Torque Check Tool (1) to rotate wheel and read rotating torque.
6. If rotating torque is less than 41 N·m (30 ft. lbs.) or more than 271 N·m (200 ft. lbs.) on either wheel the unit must be replaced.

With one tire on the ground and in neutral you shouldn't be able to spin the wheel without sufficent force.
--Hop

 

I have the 3.92's with limited slip. It was my understanding that limited slip means it will send power to which ever wheel has traction not that it would lock up and turn both wheels or put power to both wheels. I am not a mechanic and am only giving my understanding of the limited slip rear end. I do know that I have driven 2wd trucks for the last 12 years and have never been stuck going in and out of our place in S Tx. We have a 12mile dirt road and when it's wet it's a mud bog in some spots and I've always been able to get through them so whatever the limited slip is doing, it's doing it very well. Try the test above but just lift one wheel off the ground, try turning the free wheel, I don't think that it will turn if there is still one wheel in contact with the ground. Jeff.

 

Limited slip applies power to the wheel with the least traction.

 

Backwards!

 

http://auto.howstuffworks.com/differential4.htm
Clutch-type Limited Slip Differential

Image courtesy Eaton Automotive Group's Torque Control Products Division
The clutch-type limited slip differential adds a spring pack and a set of clutches to the open differential.
The clutch-type LSD is probably the most common version of the limited slip differential

This type of LSD has all of the same components as an open differential, but it adds a spring pack and a set of clutches. Some of these have a cone clutch that is just like the synchronizers in a manual transmission.

The spring pack pushes the side gears against the clutches, which are attached to the cage. Both side gears spin with the cage when both wheels are moving at the same speed, and the clutches aren't really needed -- the only time the clutches step in is when something happens to make one wheel spin faster than the other, as in a turn. The clutches fight this behavior, wanting both wheels to go the same speed. If one wheel wants to spin faster than the other, it must first overpower the clutch. The stiffness of the springs combined with the friction of the clutch determine how much torque it takes to overpower it.

Getting back to the situation in which one drive wheel is on the ice and the other one has good traction: With this limited slip differential, even though the wheel on the ice is not able to transmit much torque to the ground, the other wheel will still get the torque it needs to move. The torque supplied to the wheel not on the ice is equal to the amount of torque it takes to overpower the clutches. The result is that you can move forward, although still not with the full power of your car.