hello,
I have an 08 Yukon denali that's been nothing but problems the last year. Any ways, about 2 days ago my husband was driving the truck and went over a bump. after he said the truck didn't seem right and was driving very rough. the next day I started the truck and the exhaust sounded so much deeper and louder whether idling or accelerating. I also heard a clunking noise which sounds like it's coming from left rear. does any one have any ideas on what it might be ... I plan on getting under there today to see what I can find

if I'm not in the right place please direct me to where I should go. Thanks