i only picked up my car last thursday and when i drive it, not every time, but sometimes in first and second while taking off, not giving it ANYHTING, maybe at like 2000 RPM theres a noise from the back of the car, first time i thought it was the wheels chirpin, then when it happened again i realised there couldnt possibly be enough revs. anyways i think maybe its the drive shaft or diff ? any ideas ? its kind of a squeeky 'errr'