Warning: a couple of times recently the DEN-ORD flights have had equipment changes to 753 from 763! I've been on two flights (IIRC both from ORD-DEN, but I can't be sure) where that happened. My great 6H seat in international C became 5B on a 753. Ugh.
Interesting, the last time I flew C on the DEN-ORD route (3-class 777), it swapped to a 747 and I ended up in row 15 on the upper deck...but over-all, I gather that this route gets swapped more often than the 763 SFO-ORD route.