The plastic piece that covered the LCD screen on one of my Delco stereos has a crack in it, everything runs and displays fine, but I want to repair it. Is this possible and what is the procedure?

If its just the clear plastic piece, you can replace it. When you take the radio apart, you should be able to remove it carefully. See if you can find another piece of plastic to go in there, or mayby you can just leave it out.... as long as you are careful taking it apart you should be able to fix it yourself. Good Luck