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Towing 3rd Gen Dodge Ram Towing Questions


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  #11  
Old 01-18-2012, 02:26 PM
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When i tow my boat that is about 6000lb i get around 12MPG on the turnpike.
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  #12  
Old 01-19-2012, 08:10 PM
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Towing a 6 x 11 x6H trailer, truck has a leer shell on it. Check to see what rear end gear ratio you have, might explain the lower mpg.
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  #13  
Old 01-20-2012, 09:14 AM
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Default Gearing/towing

Got the build sheet. I have a 3.92 in the back. I just ordered a tonneau cover and Superchips flashpaq tuner. Also raising the trailer 3.5 inches so it should sit nose down more when towed. Hopefully this will all helpe my towing mileage.

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Originally Posted by letsjet View Post
Towing a 6 x 11 x6H trailer, truck has a leer shell on it. Check to see what rear end gear ratio you have, might explain the lower mpg.
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  #14  
Old 01-20-2012, 11:06 AM
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12mpg isn't too bad for a 6000lb trailer and a small displacement v8 full size truck. How fast are you cruising?

I know my father in law's F150 with 5.3L get's sub 10mpg at 65-70mph with his 8,000 lb trailer.
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Old 01-20-2012, 11:18 AM
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I think the 3.92 rear end is the issue, someone else chime in here. The standard rear end is about a 3.55, I get 20 mpg on the highway no trailer, 13.5 mpg with a 2,600 lb trailer and just got 15.5 with a 1,500 trailer. That's up and down hills. The heavier trailer required the use of the tow haul mode but the lighter trailer did not.
Before any mod's to the truck suspension for towing I'd recommend the weight distributing hitch, when installed correctly, the tongue weight is distributed over all four truck tires as well as the trailer tires, instead of just on the ball hitch.
Pretty sure the 3.92 is a dedicated rear end ratio for heavy trailer hauling. If I remember correctly: the 3.21 great highway mileage, quick offf the line, the 3.92 great low end torque and pull muscle, lousy mpg, the 3.55: middle of the road, good tow and decent mpg's.
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Old 01-20-2012, 12:01 PM
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3.92 should be much easier when towing. And the 3.21 would be slowest off the line.
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  #17  
Old 01-20-2012, 06:24 PM
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OK, I stand corrected, the 3.21 will be slow off the line but have the lowest rpm for a given speed on the highway so it will have the best gas mileage. The 3.92 will be quick but have the highest rpm for a given speed and gas mileage will suffer. The 3.55 rear end is the best combination for towing and mpg. If I remember right the 3.21 really isn't recommended for towing. Most trucks came with the 3.55 for this reason. My tow speeds were 70-80 mph.
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  #18  
Old 01-20-2012, 06:32 PM
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^that's generally true, but something to keep in mind is that with higher numerical gearing, even though you are spinning a higher rpm, you MIGHT get better mpg because you have to give it less pedal to hold the same speed. There are really too many variables to figure it out easily, but typically that's true yes. 3.92 or 4.10's though shouldn't hurt mpg very much if at all.
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Old 01-20-2012, 11:25 PM
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Default We'll see

Got my Superchips 3865 today and uploaded the tow mode tuning. We'll see how it does. Seems to be better so far, but I only ran it a couple miles to get a fill up this evening. I also ordered a tonneau cover, so both additions should help the gas mileage. Also putting axle risers on the camper to raise it about 3.5 inches so it should nose down better when towed and hopefully be more aerodynamic. We'll see.
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  #20  
Old 01-21-2012, 11:05 PM
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I had a buddie who had his and hers Jeep waggoneers, one had a 3.55 or so rear end and the other was a 3.92 or what ever comes on those vehicles. Their mpg's were way different, the 3.92 really suffered.
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