Gearing for Towing - all stock - Dodge Cummins Diesel Forum
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post #1 of 6 (permalink) Old 10-19-2014, 12:31 AM Thread Starter
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Question Gearing for Towing - all stock

https://www.cumminsforum.com/forum/to...xperience.html

I have this posted in the towing forum> Anyone have any comments or suggestions?


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post #2 of 6 (permalink) Old 10-19-2014, 08:58 AM
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The 4:10 should give you the best towing mileage and 3:42 would give you the best empty mileage, with this test you did were you towing the exact same weight and exact same load with the 3:73 vs the 4:10, aero dynamics plays the biggest roll with towing mpg's, so if the loads were not a picture perfect match then the test was garbage. Personally I don't really care for the 4:10 gears, they are too low, I'm really loving the 3:42's, I get 20-22 empty highway and 12-14 towing a 5k travel trailer. Obviously a lot lighter but still like towing a wind sail behind you. Mathematically the 4:10 will have better towing mpg and lower empty highway, the taller the gears the lower the towing mileage goes and the higher the highway mileage. I think the 3:73 is a good happy medium between the 3:42 and 4:10.

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post #3 of 6 (permalink) Old 10-19-2014, 12:43 PM
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FWIW, my 12 mega has 35" tires, 3:73s, auto tranny, I and was considering a "regear", as I pull a 5th wheel toy hauler.

I downloaded an RPM vs gear vs tire size chart, and realized there are so many variables. To justify a regear cost, you have to decide on a permanent tire size, and a dedicated tow speed, or towing RPM.

After looking at the chart, ad nauseam, I decided to keep the 3:73s and I just tow in 5th until getting up to 65 or 70, which I can tow in 6th on level ground. When towing I shift manually on the stalk.

In other words, if you can find a tranny gear which will give you the towing RPM, and the towing speed you want, that's obviously the cheapest way to go.

Back to MPGs....For what you are towing, your mileage sounds about right to me with your 3:73s. I just decided to get the engine happy, and let the MPGs fall where they may. My truck seems to be happiest towing around 1800 to 2000 RPM, though I sometimes tow on level ground at slightly less RPM.

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Last edited by NC4stroker; 10-19-2014 at 12:47 PM.
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post #4 of 6 (permalink) Old 10-19-2014, 01:59 PM
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Quote:
Originally Posted by Vatalaro View Post
I get 20-22 empty highway
What size tires are you running?!

2012 2500 SLT CCSB 4x4, Carli Fox 2.0 Commuter Suspension Package, 20" Stock Laramie wheels, LT295 Firestone Transforce, TT1 Tuner W/ OD unlock, Flow pro 4", Sinister EGR del, 3.42's
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post #5 of 6 (permalink) Old 10-19-2014, 05:19 PM Thread Starter
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Stock. 235/80R17 Dually. Exact same load. Shipping 1200 of same Racks-5 at a time. Lol. Truck feels good with 4.10 but lost 1 mpg everywhere. Empty, loaded trailer or empty trailer. Down 1 in all situations.


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Last edited by Lawdog; 10-19-2014 at 05:27 PM.
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post #6 of 6 (permalink) Old 10-19-2014, 11:51 PM
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Quote:
Originally Posted by Rougen123 View Post
What size tires are you running?!
265/70/17 michelin LTX m/s 2

2011 2500 SLT CCSB,68RFE,3.42's,White,SRW,Edge CTS2 w/pyro,EFI by HPP,4" FloPro,250Kmi
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