I had asked about a clunking noise on acceleration and braking on my 2005 grand prix in a thread quite some time ago. I found out that the problem was the lower insulator was actually loose for i'm assuming for quite some time. I attempted to take out the 18 mm bolt to relace the insulator rubber and washers but the bolt snapped. I had to losened the other 3 bolts holding the subframe up....now the bolt that broke off is not broke off flush but about an inch long....my problem is.. it seems that the metal plate that it is threaded into is moving inside the body....any ideas as the best was to solve my problem guys ...any help would br greatly appreciated.