It looks like you're new here. If you want to get involved, click one of these buttons!
Legacy rear differential troubleshooting
I put that car up on jacks and checked the DOJs and they are tight. The boots are not ripped and are in good shape. There is a little slop laterally on both axles which seems normal to me. There is some up and down movement at the oil seals where the DOJs connect. The wheel bearings are tight.
I turned on the engine and put it in gear and I did not hear anything abnormal from under the car. What I did notice was that the right rear intermittently engaged slightly while the the left rear was rotating. I would have expected it to not engage at all unless the left rear was held. Is this indicative of a differential problem? Is there other troubleshooting that I can do? Could the noise disappear when the car is jacked up. I do not see anything loose under the car.