O.K. I want to swap out my spool for a lsd. I would leave the spool in before going to a locker. I asked moser, they said truetrac. I asked jegs, they said auburn pro series. I asked summit, they said a locker (because of my power level). My car has a big block making in the neighborhood of 575 hp. In the future I may use nitrous so when asking , I was looking for something that would live behind 700 hp. I have a moser 9" rearend with 31 spline axles. When researching these lsd units I was not comfortable with either options. Was hoping that asking tech dept. to be given an answer that would strip away any doubts I had, but it did not. I guess I just want to know the opinions of people running lsd's at this power level. What would you recommend and why? My car will be street driven (to cruises,not a D.D.) and go to 1 or 2 track rentals (quarter mile) a year.