Quick update... it appears I have several different driveline noises. Most of them appear to be made much more noticeable by the diff/subframe bushings. The clutch in/out noise has been increasing, and I was able to get it up in the air today. Checked the driveline by moving the driveshaft back and forth and using a stethoscope, and the noise seemed to be coming from the rear end. Swapped the old diff back in, and 90% of the noise is gone.
