Last nite i had my GSL-SE up on a lift.. I would spin the wheel slowly and the other would spin in the same direction also, But when i would spin it fast from a dead stop the other with spin slightly and then stop while the one i spun would continue to spin. Is this supposed to happen or is this symtoms of a worn LSD

 

Put the trans in neutral, handbrake off, block the front tires, and jack up ONE rear wheel. Try to turn it. It should be hard to turn, and as you apply more force to it, it should break free and turn easier. I'm not sure what the spec is (measured with a torque wrench on a lug nut) but a good guesstimate is about 40lb-ft before it breaks free.