Diff Ratio Dilema

I also have a 2004 Hemi but have the 545rfe trams I was really happy with 3:23 for highway cruiseing and great on hill climbs and I have never hooked upped the overdrive switch yet. Which I think I will do to see how it does good luck. My 3:73 gears are from a Ford Explorer 8.8 rear end I'm using the 3:23 were from a 8 3/4