can you crawl under to look at the pan??? the 999 will have one simillar to the 904 where the 727 has a kickout on the pass side front of the pan. my money's on a 727, because i was under the impression that auto equipped D series based trucks (ramchargers/traildusters included) got a 727 due the the GVW/load hauling ability, even the slant 6's.