[SIZE=2]Ok guys,
So had to take my car in for service before I sell it and borrowed girlfriends MCS. She babies the car and I drive it like it should be driven. So today I was getting on the freeway onramp at about 75mph in a swooping right hand turn(from north south freeway to east west freeway)and it sounded like I was pouring sand across the rear seat. My girlfriend keeps a backpack in the back and a jacket on the backseat, so I thought that was what was making the noise. Turns out that was not the noise from jacket or backpack and cant find out what it is. I took everything out of the car, even the car manuals out of the dash and the change out of my pockets LOL. Took the same swooping turn and the same sound happened again. The turn lasts about 30 sec so what ever it is slowly rolling across the car (LIKE SAND).Has anyone had this sound happen to them? Could something have been left in the car from shipping? Any comments would be helpful.
Jason
sorry so long
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I heard a similar sound when I do hard right turns, but it was from the left front. I just figure it was the run-flats; seems that they don't squeal like regular tires.

 

I was thinking it was the tires also but I can not get the sound in a hard left turn only right turns make the sand/water sound.