id say its a good idea based on that it does affect alignment in the rear...
it is held in at three locations, the two main rear sub frame mounts two big bolts, and the rear yoke...at the diff mount - four little bolts...I did not catch where your are located before I started saying this...but the two mains can be aged in there and it is pretty hard to penetrate with oils...you have to soak and let capillary action do what it can...
hows the ride?
Jake