Replaced my belt, tensioner and .pulleys. but after a week or two starts squealing again. Any suggestions. I have a 95f150. 4x4 5.8l

 

Check pulley alignment, turn all the accessories by hand to see if any are dragging or have worn bearings. You can remove the fan clutch and fire it up to rule that out too. My fan clutch was the source of my squeal.

 

Thanks. Gives me something to do today