I have an 88 turbo with a grinding noise from the lsd differential. The grinding noise only comes on when the car accellerates in the beginning of 1st gear then it completely goes away..and sometime when I do a California-Stop and pop it in to 2nd gear and accellerate it'll grind in the beginning. The rest of the gears are silent. I had a couple of people giving me some solution that it's the drive shaft u-joins..or the gears inside(that I need to get a new LSD replacement)..or adding some kind of LSD fluid that'll make that grinding noise go away. If you can help me out, that would be GREAT!! Thanks a Bunch!!