Just FYI, if anyone's interested, this happened to me last year. I just bought my blazer and about 2 weeks later I started hearing a creaking noise from the front end. I thought it was my brakes or something but one day I figured it out. The top mount on my front differential had broken off. So what, right? Well, the creaking noise was made as the gear box pivoted down on it's lower mount. The result was (how I discovered it) that the inside end of the driver side tie rod butted up against the gear box, and I could only make a very very very wide right turn. I was pulling out of my driveway, and I ended up in the neighbors lawn. Anybodu else had this happen?
"But Officer, I was only trying to gain enough speed to get over that hill up ahead."