I was driving my car home when I noticed what sounded like a rattle in my door. I hit the breaks, and the rattle stops. I repeat this several times coasting with the door open listening to where the sound was coming from. It was coming from the rear of the car. I get the car home, put it up on jacks, take the rear wheels off and check the breaks thoroughly. They all look fine. I run the car in drive with the car on jack stands, and I don't hear the noise until I step on the breaks. Then the transmission makes a clacking rattling sound every time I hit the breaks. I shut the engine off, crawl under the car and spin the rear wheels with the car in neutral. Turning one or both rear wheels either forward or backwards produces a rattle in the front of the transmission. Is this normal? I've never heard this kind of noise from the car before, so I'm not sure what to expect. I assume the rattle I hear in the transmission is the same rattle I first heard driving the car home. Any suggestions or comments? Walt Tampa, FL