Hi. Sorry if this is in the wrong spot. if it is let me know.
thanks. but i got a '03 7.3L, 4x4, CC long box, automatic, 170,000miles. I was driving up to the gas station tonight and notice a wierd sound. it sounded a little different when i started it, but it was cold so i didnt think much of it. sounds like a vibration somwhere on the engine. i know its not the 4 wheel drive. pretty positive it is off the engine some where. checked all the pullies with th belt ON and they all seemed ok. the top idler pulley is a hair loose, but dont think its the problem. the sound seem to be louder a couple times at around 2200rpm, but it was only a few times. not sure what it is. dont think my water pump has been changed, but it felt snug and looked fine with the engine running. not sure, now i am scared to drive my truck.
let me know what you guys think. thanks