I see.
The best part to change while the diff is out is the collar/bush in the bottom of the hanger mount. [ the one that the pivot pin goes through.] This is usually eaten away from oil leakageof a bad pinion seal.A very important trick here is to make sure the hanger is at 90 degrees in relation to the left axle casing before tightening the cinch bolts. This is imperative because that is a suspension flex joint that travels through the same arc and the right angle puts it at No load/ neutral position..
The other mount that usually is bad is the trunk support.. This should stick up at least 1/4" above the frame washer . if the washer is hitting the frame , the mount has collapsed..