My truck makes a chirping (cricket) noise under load at exactly 1300 rpm. I believe it is the tensioner. Based on the index marks I am at the bottom end of the tollerance on the tensioner. I am at 55K and 5 years old now and my belt looks good. My questions: 1) Could the noise be something else? 2) Should I replace the belt even though it looks good? 3) Do I need to remve the fan shroud to replace the tensioner? 4) Where is the best (cheapest) place to buy a tensioner?