turn the steering wheel one turn either direction, get rolling at 5 mph, floor it. 1 tire track=no LSD, 2 tire tracks=LSD.

can also be done in a straight line if you wet the tires first. one tire taking off and truck not going anywhere fast= no LSD.

 

If you can PM me last 8 digits of your VIN, I can answer these questions for you..DAVID

 

im pretty sure it says it on the equipment and package tag in your glovebox....i think....

 

They all have the 3 speaker holes in the dash with and without the Infinity system. If no Infinity, there will be no speakers under the holes.