ok first of all i was asking how it works...so i guess my is answer the diff can be replaced..ok thanks...next i dont "let" the wheel spin as if im trying to do a burnout...i said this was my first gtp..not first car!! i just notice that when i take off hard, that one wheel spins more than the other....as i stated in my tcs help thread.. i cant turn it off! it says off but its not..as for the whine ,it sounds almost like a power steering whine, but pretty sure its not. never said this car was in perfect condition..supercharger oil has probly never been changed! so that could be part of my problem too. came on this forum to get some knowledge on this car, not smart ass answers....ur talking to someone on the other side of a computer screen, you no idea what knowledge they have, what kind of automotive backround they have,etc...so...try again on ur replys please...thanks