I flushed with 2 gallons of oil, if you think it would help to use kerosene/diesel/spirits I'm willing to try. I searched that oil pan with the camera, dragged strong magnets across the pan to the drain hole, nothing but a tiny bit of powdered metal- EDIT I snagged 2 more fragments from pan now.Could always do what has been already suggested and flush down distributor hole with either Diesel, Kerosene or Mineral Spirits.
Might take a while before it bites you - if it bites you...Like a puzzle, pieces fit but missing one. I have magnets on pan. I'll run it awhile and cut filter open, change oil and look again. Took another break
They're old 2.5" flowmaster chokemasters I had a long time... 3" collectors/3" pipes. I remove the pipes in a few minutes for racing it's just v-bands and loosen one nut from a rubber strap on each exhaust dumpWhat brand Mufflers are on your truck?
See comment #26 in the threadI've used a strong magnet dragged across the bottom of the pan towards the drain hole. It'll pull any parts sitting on the bottom of the pan.