My son has a 2004 SRX AWD 4.6L with 100K miles and when driving at any speed it feels like the rear end not tracking correctly. For lack of a better term it wobbles back and forth, it's not consistent but random. Tires are newer and it was 4 wheel aligned at the time. I've looked at all the tires and there is no evidence of a separated belt. The swaybar links and bushings all look good. At first I thought it was rut tracking on the older roads here but I ran it down a newly paved road and same thing. I've read a couple issues online with the rear sub frame welds failing and actually causing the car to spin out. A TSB was issued for the 2005 SRX for this but not the 2004 I guess. Can anyone explain to me or post a diagram of where to look on the rear sub frame for possible broken welds. Also read a couple issues with broken mounting bolts in the sub-frame.