When I first start my car and reverse my car out, I hear a noise from the rear. Then when I put it into first and goes foward, it also makes this noise. I brought it to the dealer and they were able to hear the noise again. They warranted out my rear differential they said but the noise is still present. Anyone know what else I can do to make the noise go away? I don't think the dealer replaced the rear differential like they said they did. Also I only notice this noise when I first reverse my car in the morning only. Once I have warmed up the car by driving it, the noise is gone until i leave the car off for a few hours. Please help thankyou.