7.3l until mid year '03........... I'd have a hard time buying a '03-04 6.0L. I've heard of two pretty bad horror stories from folk I know and I believe there's a LOT more issues from folk I don't know. Everybody I've talked with that has an '05 or newer hasn't had near the issues (if any).Didn't the 6.0 PSD come out in 99?
Edit....Did some reading and it was released in 2003.
Your golden with the the 7.3.....Not so if you had the 6.0.