1. ebrake cables: look them over make sure they are not being pulled or rubbing when the suspention articulates.
2. spring isolaters: make sure they are still in good shape.
3. Re-tighten the shocks, control arms, sway bar
4. bearings: jack up the rear of the car and let it run in gear listen for noise.
5. check the exhaust and make sure it is not rubbing on anything.
if you check all of these things you will most likely find the problem. I just put on MM rear control arms at christmas. I stated to get a squeek when I would take off. front passanger bolt just need to be snuged up a bit. I found it by just retighting all the bolts. when I got to that one and tightened it it made a squeek. it wasn't loose but obviously had backed off a tad.