I was just coming home from work when I heard a very loud POP sound underneath my truck. The sound seemed like it came from underneath the truck near the driver side (right under my feet it seemed). I cheked under the truck and didnt see anything and checked to make sure nothing was leaking afterwards. Any idea what this might be? Also I didnt see anything that I ran over on the road unless it was a rock that hit the undercarriage. Please help.