driveshaft play.

[E30_(1st Musk)_]

i dont know if my problem is exactly the drive shaft or my lsd.(havent checked the fluid). but whenver i back out of my drive way or a parking spot. i hear and feel parts grinding in the back... also when my pops checked under the car he said that the driveshaft felt loose..bearings?lsd fluid? any ideas?

[whiltebeitel]

The play in the driveshaft could be bad u-joints. They aren't serviceable, and you might as well get s good used driveshaft instead of having it rebuilt. Note that the the driveshaft can lenghten or shorten a bit to account for changes in the suspension. The grinding may be a seized or dragging caliper, or a bad e-brake. I would check these first before I would suspect the diff.