This happened just this past saturday night. My buddy was over and we were swapping in the 3.73s in place of the 2.29s in my monte. Everything went smooth, got it done in a couple hours without breaking something! So I topped it off with fluid and finished bleeding the brakes and i was pumped to see what kind of a difference it will make. I went inside to clean up and had my buddy put the tires on. So I pull the car out and we go down the road and after about 2 miles I start hearing a faint hum and the car kinda shakes. Im trying to think of what it is when I ask my friend if he tightened the lugs, he answered with an "oh sh*t" look. Just as I start to pull over the rear end starts swaying side to side and begins violently shaking. Luckily I had a 4 way under my seat so I tightened them up, each one had probly 1-2 threads keeping them on. Needless to say I nursed it back home and torqued them down immediately! Not much of a story but it could've been real bad!