95 7.3 Making a strange noise buzzing
 

Hi I am new here. I just found the site while searching the internet trying to identify a noise. I have a 95 7.3 that started making a buzzing like sound between 1000 and about 1300 rpms. Sounds like the turbo to me. I have had the truck for the last 2 years and never had the noise until yesterday while pulling my camper to Indiana. the truck seems to run fine otherwise. I brought the truck back home today ( 400 miles ) and it was fine. I have to go back out in 2 weeks and get the camper and would like to be sure it is ok before I go. Any help would be appreciated
Chris