The hemi is a large engine for sure . I was able to add some items under the hood , catch can, switch pro . I could have mounted the ARB dual compressor but chose to mount that in the spare jack area. I think the kits out now have solved the "cooling" issue with the hemi. I live on Oklahoma and the summers here are stupid hot. i have not had any cooling issue . the kit came with a JL fan and heavy duty radiator. I swapped in a 180 degree thermostat ( ran a 180 thermostat in the 3.8 too) . I can run the AC on full blast and the engine runs cool. I do agree that the newer LT engines are high speed and offer a packaging advantage. The only "concern" I might have with the hemi is the alternator location. Its low and not easy to access. i would prefer the 6.4 accessory drive off the 2500 ran instead of the car accessory drive. When it comes to selection of a kit and drive train I would not mix drinks , stay with one manufacturer. Go all mopar or all chevy . when it comes to any maintenance or trouble down the road you would have an easier time with troubleshooting and parts availability.
6.4 Hemi swap questions
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I certainly do love the sound of the Hemi! My two door Rubicon "2010" is relatively light on 33"s, because it needs to be. I'm in a hilly area of the country too, not Colorado but 5000' mountains and lots of grades to deal with. I tuned it for 93 octane and with the 4:10's it gets decent gas mileage and I towed up to 2000 lbs. 129K miles. It is so quiet and smooth and bullet proof reliable, I don't want to gamble with ruining it. However, I'm an old time enthusiast and that is hard to be cured from. 
I agree I would build it on my own, with a kit so I understand it better. The ls is perfect, but if I'm going that route of a GM powertrain I want a 10 speed. The LT is not on the smaller side either. It is lighter though and I would not want to put too much weight over the front axle. Some day, right now I'm completing my 12th year of college payments with four more to go............. Right now it's like buying a new 392 Wrangler every year and then crushing it.......... ha ha They are worth every dime though!
I agree I would build it on my own, with a kit so I understand it better. The ls is perfect, but if I'm going that route of a GM powertrain I want a 10 speed. The LT is not on the smaller side either. It is lighter though and I would not want to put too much weight over the front axle. Some day, right now I'm completing my 12th year of college payments with four more to go............. Right now it's like buying a new 392 Wrangler every year and then crushing it.......... ha ha They are worth every dime though!
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