Originally Posted by padgett
I'd start with synthetic oil, "water wetter", and a 180F thermostat. Agree the Pentastar likes more revs than a Hemi or Diesel.
I also use Torgue Pro, a dongle, and a 7" Android tab to monitor a lot more parameters. What you want to do is to keep it out of PE (performance enrichment) mode except for short bursts and not a 7/7 grind. It does like what seem to be high revs - 3500-4500 and has a very flat torque curve. Are you climbing in 2nd gear (55 mph = 4100 rpm) ?
May make some mad but HP really only matters for accelleration. Torque is what climbs a hill and the lower the gear the more torque goes to the pavement.
BTW my '12 also has the tow package but with 2WD you did not get much, just the hitch, wiring, and a full sized spare.
I'd toss all that in, and check around for a higher performance radiator, possibly a higher performance oil cooler from the aftermarket as well.
Presumably your fan should sound much like a hovercraft before you get anywhere
near limp mode--again aftermarket refitters for desert off road geeks might have something better than standard Mopar. Same for water pump.
Too bad it isn't the 4.0...
Are all your shrouds in excellent condition and correctly installed? Those can make a difference.
You might want to check compression and ignition timing--not expected to be the issue but a very small exhaust leak into the water jacket might exist, or retarded timing due to fuel quality causing it to back off to avoid detonation would be worth looking at before hitting the aftermarket.
What are the outside temps, and your engine rpm averaging uphill? A lugging engine will heat up fast.