Well…my problem turned out NOT solved ! So this weekend I went at it again, keep in mind I had already secured the hood latch cable under the hood and in the cab, taped the mirror plastic up so I could check that off, same with the moulding strip on the cab and the black plastic piece on the driver side cowl. All this plus the stuff in the post above related to the inner door plastic!!!!
Thankfully persistence paid off!!!….something told me to look lower so crawled under the truck just behind the front wheel and discovered that the front mud guard had a tab on it that was not installed properly!!! I was wondering it this could possibly be it….so I pulled 1 10mm bolt out and replaced it so that it held the plastic tab in place. To my pleasure I’ve driven 75 miles and not one sign of the plastic rattling I was hearing that drove me bonkers!!!
hope this helps someone!!