Hey fellas, been awhile since I've been here. I've got a new problem, this time with the 2000 Trans am ws6 rear end. The rear end is making noise like a grinding sound. I brought it to service station and had them change the fluid (synthetic). The rear end still makes noise and it seems to be getting worse. The guy who changed it never took off the cover to inspect he just "sucked" old crap out and put in new. I'm guessing he put in the additive but wasn't sure so I took some some fluid out and added some limited slip-posi additive. The car still makes noise. I jacked the car up and spun the wheels and they don't spin in the same direction, they spin opposite of each other. what does this mean? Does this mean my posi is shot? I'm pretty sure that this car came with a 3.23 ratio and posi. Anyone have any insight? Ineed to sell this car help!