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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I wouldn't be so fast to jump to a colder thermo...ive seen it play holy hell on the sensors and inection systems. That engine is designed to run between 190-210 and the computer is programmed for that. As far as plugs go...i'd go for an NGK "R" type plug...no platinum or special electrodes...those cause a loss in performance on the 3.7/4.7/5.7.