Grigg: I have been driving this particular truck for 36 years and not had this problem until a couple of days ago. I don't think I changed my driving habits all of a sudden? Anyway, as I mentioned, it stopped doing this 'chattering' on an outing yesterday so I will count myself lucky for the time being. Thanks for all of your feedback!!!!!
Flywheel pressure plate......hummmmm.......thanks for the suggestion Darin367
littlebuddie