hey guys i need some advice on what could be my problem for my 02 cavalier 2.2 non eco engine...i just noticed today when the car is runnin and in park when i switch it to drive and then to reverse it makes a sound..i thought it could be the transmission cause it has like 52000 miles and i haven't changed the fluids yet.. my dad said it could be the axle shaft..it sounds like when it goes from drive to reverse it floats a bit before the shaft catchs in place and that what creates the noise... any advice will help thanx guys