We finally found a tech that has been trained on these new differentials in the 2004.5 Ram Trucks.
The antispin differential is a "Differential-Trac-Lok"
Operation (from the tech's Manual):
This differential clutches are engaged by tow concurment forces. The first being the preload force exerted through Belleville spring washers within the clutch packs. The second is the separating forces generated by the side gears as torque is applied through the ring gear."

To test: Put one wheel on a slick-wet surface and the other on a dry surface. Push the gas, allowing the wheel on the slick surface to spin and than TAP the regular brake pedal once and than you should feel the other tire engage.

Or for shop tests (straight from the tech's manual):
"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 netural, and parking brake off.
4. Remove wheel and bolt Torque Check Tool 6790 or equivalent tool to studs.
5. use torque wrench on Torque Check Tool to rotate wheel and read rotating torque."

Personally, the first test is much easier.

I also was told (this is what confused everyone) and I tested and found true. The Differential-Trac-Lok will act like an open differential when you just jack it up and turn the wheels - one will go one way the the other will turn the other way.

Now on my sales sticker, in the manual and everywhere else on the truck it does call it an "antispin differential". but on the 2004.5's it is the Differential-Trac-Lok made in USA.

Hope this LONG explaination helps.

 

I thought that there is no clutches in these rears

 

if you've got the 11.5 rear end, there is no clutches... there are brake shoes in the rear for the 6 pinion gears though...