I bought the truck a few months ago, sounded like that when I bought it.
I have not seen a visible exhaust leak... where should I be looking?
As for being mechanically inclined, I am pretty good with my hands but I have zero experience with internal combustion engines... I will take a jet engine any day though.
Just to be clear, when I set the valve clearance I keep the engine on?
As for the "thump sound" the video does not do the sound justice. It sounds like someone it hitting the firewall with a rubber mallet.
