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I'm just starting out modding my '02 4.7, and read one of the less expensive upgrades is the 180 degree Thermostat. I've seen the Robert Shaw ones mentioned a couple of times, but can't find one anywhere. Jet makes one, but not for the 4.7, and even getting a higher temp Tstat at the auto parts store was $22(!) and had to be special ordered. I didn't think it would be this hard to find a seemingly common $9 part, but evidently it is.
Found my own answer-----there are no 180tstats anymore for the 4.7, just gotta get one for the 5.8 and cut a notch, drill a hole to match the 4.7 and it doesn't sound too hard.