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Old 11-02-2015, 12:54 PM   #15
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If you want to be specific about specifications, Airstream also has a limit of 1,000 lbs tongue weight and the Owners Manual tells us to "never exceed" it. My Ram has a so-called payload rating of 1,360 lbs and states I "should not exceed" it.

So the payload police need to decide which manufacturer's spec they want to violate. We load our Airstream and Ram 1500 to violate neither. The o.p. can choose even the lowest payload Ram 1500 and do as well, if he wants. Or he can choose a Ram 1500 with a greater payload if he wants.

The highest weight a 27' Airstream can be is 7700 lbs and most of us don't load it that heavy. But if you did, you can load and/or set up your Airstream for a 770 lb tongue weight to be within the 10-12% tongue weight Airstream recommends.

The reality is Ram 1500s carry lighter loads than Ram 2500s. It is quite possible to travel within the spec's of either. And don't talk about load safety margins provided by Ram 2500s unless you're also willing to stay well under Airstream's tongue weight specification of 1,000 lbs. And then you don't need a Ram 2500 to carry less than 1,000 lbs Airstream tongue weight, a Ram 1500 will do fine. A decent weight distribution hitch will reduce the payload added to the truck even more and put it on the trailer axles, about 200 lbs more/less depending on a number of factors.

Yes there are many other reasons someone may have to tow a mid-size Airstream with a Ram 2500 but tongue weight is not one of them, if you really are interested in staying within all the spec's.
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Old 11-02-2015, 01:10 PM   #16
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Our TV is a Jeep Grand Cherokke Summit with a 3.45:1 ratio and 3.0 Ecodiesel engine.
(http://www.wk2jeeps.com/2014/2014_wk...ifications.pdf). We pulled our 2015 23' FB from Seattle to St. John's, Newfoundland in all kinds of weather and terrain. Averaged 16.4 MPG over 13,700 mikes in 95 days (32 mpg highway without trailer). Absolutely fantastic up and down any mountain pass. Paddle shifters are a great feature and 8 speed ZF transmission is terrific, too.
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Old 11-02-2015, 06:32 PM   #17
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axle ratio for tv

I have a 2000 Ram Cummins. Ordered it 4.10 axle ratio. Works super pulling Airstream. A lower gear ratio, higher numerically, is much easier on the vehicle drive train while towing. Use of overdrive lockout while an uphill grade is encountered, keeps the transmission from constantly shifting which generates trans heat and is a trans killer. Fuel mileage shouldn't be a concern while towing anyway. Great mileage when towing just isn't a factor. Go with the higher numerical axle ratio. Towing over mpg at 2,000 rpm's, 60 mph results in average around 13 mpg depending on terrain.
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Old 11-03-2015, 06:42 AM   #18
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I have a Chevy 1500 with a 5.3 engine and low number rear end. I pull a 30 ft. Classic and it works wonderful, I do not even use the tow haul.

The 3.21 will make for a much better pickup when not towing and will give you not only better mileage, but longer engine life.
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Old 11-03-2015, 06:48 AM   #19
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We have several Rams in our family... 3:20,, 3:55 and my truck with 3:92s gearing.

What we see is my pu with 3:92s is able to make use of the 4 cyl running option more time than any others.. And over all empty or loaded my 3:92 gearing gets better over all MPG...

For me,, the best way to picture what is going on about gearing is to remember back to our bikes as kids.. Some had a long stork peddles and others had short.. The short stork peddles worked ok if the front gear was small.. If the gear was large the bike was useless for about everything.. Sodbust
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Old 11-03-2015, 09:05 AM   #20
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Different rear axel ratios

Jamesbford is your handle and you're not gonna buy an F150? Kidding I'm kidding.........

Oddly enough and FYI our '15 F150 with MaxTow specs the 3.5 Ecoboost and 3.55 gears. The previous gen 9-14 F150 MaxTow spec'd 3.73 gears....... So far so good towing our Flying Cloud 27fb (sister to what you want) although we haven't been on any real grades yet. Oh and our version of the F150 got us 1907 lbs of payload.


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Old 11-03-2015, 09:59 PM   #21
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Just purchased a new/used 2015 25 flying cloud from lazydays tuscon. I have a 2014 ram 1500 v8 with 3.92 no problem up or down the hills using the 8th speed nor tow mode. Ran at 2500 rpm at a 4%grade and 2900-3100 rpm at 6% traveled mostly 10 to 93 to vegas than over Hwy 58 to Bakersfield. 13 mpg at avg speed 65 mph
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Old 11-03-2015, 10:57 PM   #22
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You best look at the payload capacity on the Ram eco diesel. I have a 25' - 1000# tongue and the manager at the Dealership when learning of my tow need, said no and steered me to the Hemi with 3.92. I ended up with a different choice but... Just sayin. The payload was something like 1200 or 1400 on the eco diesel.

Quote:
Oh and our version of the F150 got us 1907 lbs of payload.
Yep and if you get the 20" wheel it drops it to 1720 lbs payload- my observation.

Quote:
If you want to be specific about specifications, Airstream also has a limit of 1,000 lbs tongue weight and the Owners Manual tells us to "never exceed" it. My Ram has a so-called payload rating of 1,360 lbs and states I "should not exceed" it.
That's a new one for me- a set limit Airstream has for tongue weight. I thought it was whatever the published weight was as a model.

You want to match the rear gearing to the engine and intended use. Higher numbers for more pull power. Lower numbers for better mpg and less power. Wheel/tire diameter will also Change the ratio- bigger wheels lower ratio. Smaller wheels higher ratio
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Old 11-04-2015, 12:16 AM   #23
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rodsterinfla, I wanted to see if the tongue weight warning was in your Airstream Owners Manual as it is in mine. So I looked up the 2006 Safari Owners Manual and copied it:

"! WARNING: The tongue weight should he approximately 10% of the trailer’s total weight, but MUST NOT EXCEED 1,000 lbs. And, under no condition should it exceed the hitch rating. Your hitch installer should provide your hitch rating information."

That indicates the parameters we must set up and load our Airstream within if we are sincere about manufacturer's specifications, and in this case, warning. Check your Owners Manual, I believe it applies to most if not all late model Airstreams, mid-size right up through the Classics.
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Old 11-04-2015, 05:22 AM   #24
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Never, ever quote from the manual. You will confuse those who have never looked at it, and upset those who don't agree with it!
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Old 11-04-2015, 05:24 AM   #25
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Quote:
Originally Posted by Jamesbford View Post
Greetings,

My wife and I are on the verge of purchasing TV. It's a Dodge Ram 1500 with eco-diesel. I have found two to our liking. My question regards the rear axel ratio. One has a 3.21 ratio, the other a 3.55 ratio. Is there much difference between them? I know the 3.55 gets higher gas mileage while the 3.21 has better tow capacity, but is the difference significant enough to definitely purchase one over the other?

Many thanks!

Jim Ford
Kensington, Maryland
If the truck has an 8sp trans get the 3:55. With the advent of 8sp trans, rear end ratio is less of a concern now days.
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Old 11-04-2015, 04:01 PM   #26
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Originally Posted by r carl View Post
If the truck has an 8sp trans get the 3:55. With the advent of 8sp trans, rear end ratio is less of a concern now days.
The 8 speed has two of it's gears overdrive, 6th gear is 1:1 ratio. My concern would be the constant "hunting" for the best gear to torque range we often see when towing with higher gears. If 3.92 would prevent much of this, that's the one I would choose.

That is an issue with our Ram Hemi and we can shift down and leave it there to prevent it. However it would be nice to have the full range of the transmission gearing available going down the road.

Any Ecodiesel Airstreamers out there can help out? We can go to other forums to have some ideas, but our Airstreams supposedly pull 20% easier through the air, which may be enough to move from one axle ratio choice to another.
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Old 11-04-2015, 04:06 PM   #27
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Get the lowest axle gearing (largest numerical axle) they offer. You will be glad you did.

I put 4.30 on my F150. The motor is much happier and towing MPG improved.
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Old 11-04-2015, 06:05 PM   #28
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Dkottum, I don't know if your 2012 Ram has the Tow/Haul mode, or if it was modified for my 2015, but I find that it significantly reduces the tranny shifting in moderately hilly terrain. Although, it could also be that I have the 3.92 rear end.
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