Replace those sagging, dry rotted rear sub frame bushings on your AWD 3000GT or Stealth with something that is more robust than the OEM bushings. These polyurethane bushings come in a metal housing, just like OEM. They are solid, where-as the OEM bushings are rubber and have 2 hollow portions. When the rear differential bushings go bad, it can cause the driveshaft to thump on the floor of the car. You can easily tell if they are worn by look at the mounting brackets of the rear differential and noticing if they lean to one side or the other. Often times, the brackets are leaning right up against the rear sub frame.