Hi guys a weird thing happened to me today . I work at a Chysler dealer in Canada and was having trouble finding a grinding noise in a 09 journey with a 3.5 . I googled and found this forum ,i read some of your concerns that you have had with you cars and used that to diag. the problem .if your having a growl or grind you can also hear the belt tentioner I found the right engine mount making the noise . hope this helps . Oh and be nice to your Techs... we sometimes fix the first time!!!