help me figure out this squeak im hearing at the rear passanger side of the car

[AlligatorBling]

its a weird squeek, not a break type of squeek, but different, almost like the sound of a box spring mattress... its not constant, it will squeek when im going at low speeds in 1st when the weight is transfered by stepping on the gas, and especialy when im shifting into the next gear when the car lunges a little bit... if i sit in the car and throw my weight back and forth and rock the car it will squeak.... its driving me effing nuts man... any ideas of what it could be? its been doing it for a while, even before i put my agx's on, so its not them.... any help is very appreciated :bow:

[TheSnail]

It may be the trunk. I have a sentra that does the same thing. Put some cardboard between the car and the trunk, just to see if it stops the sqeeking.