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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Stick it in drive, stomp on it, and see if you get one tire mark or two. Better yet, take it to a parking lot, turn the wheel all the way to one side and try the same...
Or (since we seem to be collecting ways to check), jack up one wheel... preferably a rear , put it in neutral, and release the parking brake. Try to turn the wheel in the air. If it turns, no limited-slip.
Back in the day mopar called it SureGrip. Look at the guts once, all 3 work the same way, a clutch pack that locks the 2 halves of the differential together (yes that's over-simplified).
I just got a Detroit True trac installed Friday. After the break in period i'm going to see how much abuse it will take on some "tire dangling" trails. It should be a marked improvment over the factory LS.
The good news is that when my factory unit came out there were none of the fragments of metal like so many others have reported.