I mentioned on my thread a while back about a rattle when I start my truck in the mornings that last only about 5-10 seconds and couldn't find the culprit. Well, I found it and it took me 4 months and that was "almost" too long. My fan was so loose that I could wiggle it atleast 1/2" while attached to the clutch/shaft. A new fan clutch and no more movement.

 

https://www.f150forum.com/f4/slight-...-start-289413/

Thanks for following up

 

Well....... Dahgummet my truck was sitting for about 4 hours and just cranked her up and heard the rattle again. My next task is checking all my pulleys for loose bearings because it's definitely in the front but only lasts up to 6 seconds

 

its most likely going to be chain/guide/tensioner related