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Old 12-20-2015, 11:13 PM   #81
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I've added amp steps. Very nice. And moved my flaps over from my old truck.

I love the amp step, so did you install them or the dealer, I would love to get those this time
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Old 12-21-2015, 01:10 AM   #82
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Pretty skies.... I'm not sure if I can agree on the 3.73 rear end or not. I haven't driven a gasser with that rearend. My thinking coming from th Cummins was so get the best towing gears I could. That's why I chose the 4.10.

My plan is tomorrow is to talk the dealer tomorrow and hopefully that he will be able to help me with the 4.10 gears.
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Old 12-21-2015, 08:14 AM   #83
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87 or 89. 89 recommended and 87 acceptable. I have run nothing but 87 in mine and it runs like a champ. This is as of the '15 MY. '14 was 87
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89 octane recommended. I have primarily been running 89. Thanks for the compliments folks. I am super happy with it. First truck I've ever ordered and now I'm super glad I did.
My owner manual recommends 87 octane for the 6.4L Hemi. Other sections of the manual regarding octane reiterate this recommendation. I've been using it since day 1 in my truck, and I'm at nearly 10K miles now.

I suppose with fuel prices where they are, this might be the time to run a test with 89 and see what happens?
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Old 12-21-2015, 09:30 AM   #84
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Good! Don't be scared of the 3.73s if the deal is right. The difference is not that huge. My 3.73 geared 6.4 had no issues tugging a dump trailer loaded down with skid steer and extra bucket with a bed loaded with tools.
I have to disagree, the difference is actually substantial. There are pages and pages of threads talking about the difference getting 4.10s. A couple of pages ago I posted torque output values and with 3.73 the 6.4 actually put a lot less torque to the rear wheels than an Ecoboost. I think 4.10 should be minimum ratio offered with 4.56 and 4.93 as options.
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Old 12-21-2015, 09:31 AM   #85
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Pretty skies.... I'm not sure if I can agree on the 3.73 rear end or not. I haven't driven a gasser with that rearend. My thinking coming from th Cummins was so get the best towing gears I could. That's why I chose the 4.10.
Nice, you got the exact truck I was looking for last year but couldn't find one equipped like that in a 1,000mi radius from Portland.
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Old 12-21-2015, 11:07 AM   #86
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I have to disagree, the difference is actually substantial. There are pages and pages of threads talking about the difference getting 4.10s. A couple of pages ago I posted torque output values and with 3.73 the 6.4 actually put a lot less torque to the rear wheels than an Ecoboost. I think 4.10 should be minimum ratio offered with 4.56 and 4.93 as options.
I didn't say they were as good as 4.10s, but if availability and price are a concern, I wouldn't shy away from them. They will do the job quite nicely in the 8-9k range and will suffice for over that as well. 4.10s are obviously the better choice and I wish I had them, but availability was an issue and the price to order was significantly higher than buying the one I did off the lot- so money saved.
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Old 12-21-2015, 01:48 PM   #87
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I didn't say they were as good as 4.10s, but if availability and price are a concern, I wouldn't shy away from them. They will do the job quite nicely in the 8-9k range and will suffice for over that as well. 4.10s are obviously the better choice and I wish I had them, but availability was an issue and the price to order was significantly higher than buying the one I did off the lot- so money saved.
I agree with you regarding price. But I still think there is a big enough difference that I wouldn't settle for the 3.73. When I test drove the 6.4 last year it felt fine on flat ground but it was noticeably lacking grunt in the hills.
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Old 12-21-2015, 02:13 PM   #88
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In my case another consideration whould be, how much time will be spent towing verses daily use ? Gas milage will be different with the lower gears. Although fuel prices are very friendly now, I do not believe this is a long term trend. For me, I would have more use as a daily driver. Just my opinion, enjoy your choice.
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Old 12-21-2015, 03:32 PM   #89
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In my case another consideration whould be, how much time will be spent towing verses daily use ? Gas milage will be different with the lower gears. Although fuel prices are very friendly now, I do not believe this is a long term trend. For me, I would have more use as a daily driver. Just my opinion, enjoy your choice.
The majority of the threads I read staTed the fuel mileage was actually better with 4.10 as they help make up for the poor gear spacing of the 66RFE.
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Old 12-21-2015, 07:26 PM   #90
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Hmm interesting to say the least, my plan is going in sometime this week to look at my options and since the one I want they are going to get it from there location. I'm not in a big hurry so I will see, the package they since me that have the 3.73 gears the only thing that I will add is the 4.10 gears.


I will see how long will it take to get one in from the factory this week and if it 6 to 8 week I'm okay with that. In the pacific northwest there are a lot of hill and when I get my trailer having the 4.10 gears will be awesome. We not going to be towing a lot a year because my wife and I are pastor of a church so getting away might not be an option in ours case but it will still be nice to have the right gears.
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