my rear end wines when i turn left, and sometimes straight, it has been getting louder over teh last couple of weeks, and yesterday i took along trip, and when i took a sharp left turn going slow, it made a metal-to-metal squeal, now, i hav eteh rear-end apart now, and i am replacing the trac-loc, and was wondering what could have caused that,...everything looks good i think. Also, teher seemed to be a foam sorta in there, could teh auto-zone friction modifer i put in could have caused me these problems? anyhow, anyone who knows anything would be great thanks