Since it is called a "limited slip" it won't feel much different than an open diff on a lift. The test is what happens under load. If only 1 tire leaves a mark then the clutches are worn. Heat & friction are the componets that lock the clutches up, plus the right fluid. Have only rebuilt 2 limited slips, & had to order parts from Germany. Don't think there are too many problems or most don't repair. Change fluid at least every 30K miles.