2000 mile trip with the 6.4 and Travel Trailer

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River19

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Just got back from a longer trip towing the travel trailer at about 5000lbs....not huge weight per se but still a dumpster on wheels etc.

2083 miles driven with 1600 miles of that with the trailer behind us, 2 full sized dogs, the bed/cap had ~400lbs of gear in it. Averaged 11.2 mpg combined with the towing segments mostly in the 10-10.5 mpg range. Lots of hills and mountain passes to deal with along the whole route only about 500 miles were on what I would call flat or rolling terrain. Some winds to deal with but nothing too much.

Observations towing the TT vs. my horse trailer (plenty of miles with the 6.4 and the horses):

Tow/Haul was outstanding for me on the downhills and crazy winding sketchy mountain roads in the Blue Ridge Mountains etc. Route 501 for example

Transmission temps stayed planted at 168 -170 despite long hot days.

Cruise control set for low to mid 60mph range was the way to go for me and I just managed the 5th to 4th or 3rd gear down shifts myself as CC allows for way too much slow down before it down shifts.....like 5mph.... In anticipation of a larger longer hill I would manually pop it into 4th or 3rd if I needed it

Stability and drivability was aces as usual. My wife loved driving the TT with this rig.

Downhill control ...... on one section coming out of the Berkshires (anyone who knows the area knows what I am talking about) we have a downhill grade that is ~5 miles or so at a pretty steep pitch (towing up it is a 3rd gear and hold hill)...... I had the cruise set for 61-62mph (really 64-65 with larger tires) and I manually put it in 4th.....the rig never moved from 61-62mph and I didn't touch the brakes once all the way down..... perfectly in control and I loved it. Granted 5000-5500lbs isn't a huge load, but it is enough to push you down hill.

we drove 50 miles of the Blue Ridge Parkway (without the TT) and the rig was impressively nimble for a 7000lb truck on 35s.

On the way home we stopped for 3 nights in Raystown Lake PA and at one point there were 3 other 6.4L around us at one of the lots and I chatted with a couple of the owners one was towing a 9000lb 5er and he was pleased (4.10s) stock tires and size, said he was getting about 9-10mpg coming up from GA.

Pedal Commander is in my future, I didn't want to change anything right before our trip, but the on/off nature of the pedal sometimes is friggin' annoying and my wife seemed to have trouble getting into the throttle enough in 4th to maintain speed on grades and then when she did get into it we have a lovely downshift to 2nd which is abrupt as a 2x4 to the head on the highway.....some more modulation would be nice.
 

JohnnyMac

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Great info! Thanks!
 

Rambojoe

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Thanks for posting, I'm getting ready to hit the Smokies this weekend with out TT. It is about 6200#.
 

Kev12

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We have a 9000lb 5er that I tow with my 5.7 2500. Pedal Commander is a must imo. Improved my towing experience greatly, especially in stop and go traffic and red lights
 

Kev12

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Thanks for posting, I'm getting ready to hit the Smokies this weekend with out TT. It is about 6200#.


Jealous, love the smokies. Not sure that’s a trip we will make with the 5.7 and our 5er. She does great on trips like to Disney but not ready to test it in the mountains
 
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River19

River19

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It's interesting that the Pedal Commander seems to be one of the now "go to" items that is a worth while mod that isn't really a power changing mod but sounds like it increases the ease or drivability when towing etc.

I have never driven a 5.7 but I can say that the 6.4 at sea level to East Coast mountains I wouldn't hesitate, if I were towing out west at real altitude I wouldn't have a N/A engine anyways and would probably be in a Cummins et al

For what I tow it is a great platform 5000-7000lbs for me, and I wouldn't hesitate to go up another ton.

Stability is my key attribute, I can usually drive whatever I have to maintain decent highways speeds on grades etc. but I can't fix stability easily.....band aids are band aid, but solid braking and sway resistance etc. for me is key.
 

sandawilliams

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It's interesting that the Pedal Commander seems to be one of the now "go to" items that is a worth while mod that isn't really a power changing mod but sounds like it increases the ease or drivability when towing etc.

I have never driven a 5.7 but I can say that the 6.4 at sea level to East Coast mountains I wouldn't hesitate, if I were towing out west at real altitude I wouldn't have a N/A engine anyways and would probably be in a Cummins et al

For what I tow it is a great platform 5000-7000lbs for me, and I wouldn't hesitate to go up another ton.

Stability is my key attribute, I can usually drive whatever I have to maintain decent highways speeds on grades etc. but I can't fix stability easily.....band aids are band aid, but solid braking and sway resistance etc. for me is key.

I get along great pulling the mountains of Colorado with my 8800# trailer and another 1200 in the bed. That's with 3.73's.
 

sandawilliams

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It's interesting that the Pedal Commander seems to be one of the now "go to" items that is a worth while mod that isn't really a power changing mod but sounds like it increases the ease or drivability when towing etc.

I have never driven a 5.7 but I can say that the 6.4 at sea level to East Coast mountains I wouldn't hesitate, if I were towing out west at real altitude I wouldn't have a N/A engine anyways and would probably be in a Cummins et al

For what I tow it is a great platform 5000-7000lbs for me, and I wouldn't hesitate to go up another ton.

Stability is my key attribute, I can usually drive whatever I have to maintain decent highways speeds on grades etc. but I can't fix stability easily.....band aids are band aid, but solid braking and sway resistance etc. for me is key.

I get along great in the Colorado mountains (and everywhere else) towing my 8800# trailer with another 1200 in the bed. That's with 3.73's.
 

14RAM4X4

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Those are awesome mpg #s. I took my crossroads 18ss on a 150 mile trip to the coast a few weeks back and mpg were about 8 - 9. But, when you head down from San Antonio to Padre Island National Seashores, you get a pretty good headwind. That and running at 70 -75 mph killed my gas. When I'd slow down to 60 - 65 mph, my mpg started climbing back up. Only issue is speed limit is 80 most of the way.

That x-roads 18ss is less than 4000# loaded and maybe another 1400# of gear and people in the truck. Then again, I'm also on 37s, so I wasn't really disappointed with the mpg. I was in a hurry to get down there since we left late in the evening.
 

dexter

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Tow/Haul was outstanding for me on the downhills and crazy winding sketchy mountain roads in the Blue Ridge Mountains etc. Route 501 for example

.

I use cruse control on the downhills - lower the mph setting to a safe speed.

What does the Tow/Haul do on the down hills?
 
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River19

River19

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I use cruse control on the downhills - lower the mph setting to a safe speed.

What does the Tow/Haul do on the down hills?

I attributed it to "Tow/Haul" but cruise may have done it either way, but the speed held firm even with the significant downgrade and no brake input.....I did see the truck dump from 4th to 3rd to maintain the 61-62mph setting (really ~64mph with larger tires) and I attributed that to Tow haul mode.

It may have done the same thing in straight up cruise control but I never tried it while towing to experiment.

I will say on the tight ass twisty 15-25mph mountain switchbacks (banked for no one's pleasure) in tow haul (with and without load) it would downshift to 2nd while braking and really help with the control entering those insane turns at grade. Tap the brakes, and it would drop from 4th to 3rd to 2nd like when you have tow haul on coming off the highway and begin braking gradually.
 

runamuck

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this is good info. I tow our 28' 6000# travel trailer with a 1500 Laramie but have to pack light so am shopping for a 2500. my son recently bought a dsl one but I cant justify the extra cost for my situation and it's good to know the 2500 would work fine for me. I get 8.5-10 and expect about the same mileage but more capability with the 2500.
 

HEMIMANN

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this is good info. I tow our 28' 6000# travel trailer with a 1500 Laramie but have to pack light so am shopping for a 2500. my son recently bought a dsl one but I cant justify the extra cost for my situation and it's good to know the 2500 would work fine for me. I get 8.5-10 and expect about the same mileage but more capability with the 2500.

2500 with 6.4 Hemi will tow it fine. I have np with a 7,000 lb trailer loaded to (or, um, past) the load limit. If you buy used and get the Chrysler 66RFE 6 speed transmission, it would help to have the higher gear ratio axle 4.10. I have a 3.73 which is ok, but so-so. If you buy new it doesn't matter with the ZF 8 speed transmission. The 3.73 axle would be fine.
 

sandawilliams

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I really am amazed with my 4.10's Had 3.73's in my 2014 and did OK. I decided I didnt need a pedal commander on this truck as it is quick off the line with no hesitation.
 

HEMIMANN

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I really am amazed with my 4.10's Had 3.73's in my 2014 and did OK. I decided I didnt need a pedal commander on this truck as it is quick off the line with no hesitation.

I'll assume the 2014 had the Chrysler 66RFE 6 speed transmission and your 2021 has the ZF 8 speed transmission? If yes, it's not a fair comparison between axle gear ratios. It would be if they were switched around and the 2014 ha 4.10's and the 2021 has 3.73 These are closer equivalencies.
 

MN-Ram

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I still have a 2015 with 3.73’s. I with I had gotten the 4.10’s, but oh well, it’s paid for. It is also about to get a new trannny. Haha.

It pulls my 7,000lb TT fine on relatively flat terrain. I haven’t gone anywhere yet with any real grades to try it out. I’ve only had the TT for about a year.

The Pedal Commander is great though.
 

sandawilliams

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I'll assume the 2014 had the Chrysler 66RFE 6 speed transmission and your 2021 has the ZF 8 speed transmission? If yes, it's not a fair comparison between axle gear ratios. It would be if they were switched around and the 2014 ha 4.10's and the 2021 has 3.73 These are closer equivalencies.
I understand what you are saying but just pointing out the difference in trucks.
 

MN-Ram

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I understand what you are saying but just pointing out the difference in trucks.
Is the new 8-speed a lot better than the old 66rfe? I have not heard much about it. I’m curious about the reliability in the longer term. We are seeing the “durability” of the 66rfe now that the 2014-2016 rams are starting to get into the 150k+ mileage range on many trucks from those years.
 

64zebra

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I’m taking my 6700lb TT from Texas to Wyoming in a few weeks with my my 2015 2500. The 6.4 just got rebuilt due to the wrist pin issue when it was produced. I had the MDS delete done on the rebuild. Tuned to use 91 octane. It runs great. I have the 3.73 rear end. We’ll see how it goes.
 

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