New truck thoughts, and 4.10 to 3.73 mileage comparison - Dodge Cummins Diesel Forum
2013+ General Discussion General Chit Chat About the 2013 model year differences 6.7L 4th generation Cummins - NO ADVERTISING - Sponsored by: StarLite Diesel

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post #1 of 52 (permalink) Old 03-19-2017, 04:19 PM Thread Starter
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New truck thoughts, and 4.10 to 3.73 mileage comparison

After a lot of research and test drives, I'm leaning toward the Ram (over the Chevy/GM) if I do buy a new truck in the next few months. The primary reasons are:

  1. Slightly better GAWRs
  2. Tighter turning circle
  3. The price is a bit lower
  4. I prefer the trim a little more
  5. It is not a new MY

I'm looking closer at the 3.73 vs 4.10. For my needs today, and likely in the future as well, the 3.73 is sufficient. Interestingly, I have two friends with 2014s. Other than trim, the only difference between the trucks is that one has the 4.10 (and pulls probably 18K routinely) and the other has 3.73 and pulls a 16K 5er, but also some heavier machines from time-to-time. Both are reporting fuel economy not too different from my 2012 3500HD, but the guy with the 4.10 appears to be higher than the other guy. Yeah, I think he is a slower driver, and that helps. I know there are some other factors too.

I'm curious if anyone here has used both the 4.10 and the 3.73 for the same jobs, same driver, and kept track of MPGs. In the weight ranges we're talking about 16-20K, should I expect more than 10% fuel economy differences?

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post #2 of 52 (permalink) Old 03-19-2017, 04:33 PM
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if you need the 31000#'s max towing you need 4.10, the 3.73 works great up to the 25000#'s. (as long as you get the AISIN)

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post #3 of 52 (permalink) Old 03-19-2017, 04:41 PM Thread Starter
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Originally Posted by ralmeida View Post
if you need the 31000#'s max towing you need 4.10, the 3.73 works great up to the 25000#'s. (as long as you get the AISIN)
I would definitely get the Aisin, for reliability if nothing else.

And I get the weight numbers. I was set on the 3.73, but when I realized this one buddy seems to get as good or possibly better fuel economy with the 4.10s when towing 18K lbs, why not get the 4.10?

Hence my curiosity if others have experience with both axle ratios while tracking MPGs?
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post #4 of 52 (permalink) Old 03-19-2017, 05:27 PM
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Originally Posted by tim.rohrer View Post
I would definitely get the Aisin, for reliability if nothing else.

And I get the weight numbers. I was set on the 3.73, but when I realized this one buddy seems to get as good or possibly better fuel economy with the 4.10s when towing 18K lbs, why not get the 4.10?

Hence my curiosity if others have experience with both axle ratios while tracking MPGs?
All depends on how you drive.
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post #5 of 52 (permalink) Old 03-19-2017, 05:31 PM Thread Starter
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All depends on how you drive.
True. The is why I was hoping a person has driven both using similar loads. But, that person may not exist.
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post #6 of 52 (permalink) Old 03-19-2017, 05:31 PM
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From my understanding, from what I've read on here because I don't have first hand experience. 4.10s will likely yield slightly better mpgs while towing heavy, but lower mpgs when empty compared to 3.73s.


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post #7 of 52 (permalink) Old 03-19-2017, 05:33 PM Thread Starter
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From my understanding, from what I've read on here because I don't have first hand experience. 4.10s will likely yield slightly better mpgs while towing heavy, but lower mpgs when empty compared to 3.73s.


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I think that is a great point, which I think I've read elsewhere before too.

The buddy with the 4.10 says he get 16 running around town (without a load). That seems high.
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post #8 of 52 (permalink) Old 03-19-2017, 06:21 PM
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Mpg is far more speed (aero drag) dependent than a few hundred rpm difference dependent. Drag multiplies exponentially with mph. Not so with rpm. Years of snow plowing and meticulous fuel records prove it. I can plow snow at highway rpm for 1.6- 1.9 gals per hour. That should equal more than 30 mpg. I get 18-19 mpg or 3-3.6 gals pr hr. consistently on the highway.
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post #9 of 52 (permalink) Old 03-19-2017, 06:31 PM
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Originally Posted by tim.rohrer View Post
After a lot of research and test drives, I'm leaning toward the Ram (over the Chevy/GM) if I do buy a new truck in the next few months. The primary reasons are:

  1. Slightly better GAWRs
  2. Tighter turning circle
  3. The price is a bit lower
  4. I prefer the trim a little more
  5. It is not a new MY

I'm looking closer at the 3.73 vs 4.10. For my needs today, and likely in the future as well, the 3.73 is sufficient. Interestingly, I have two friends with 2014s. Other than trim, the only difference between the trucks is that one has the 4.10 (and pulls probably 18K routinely) and the other has 3.73 and pulls a 16K 5er, but also some heavier machines from time-to-time. Both are reporting fuel economy not too different from my 2012 3500HD, but the guy with the 4.10 appears to be higher than the other guy. Yeah, I think he is a slower driver, and that helps. I know there are some other factors too.


I'm curious if anyone here has used both the 4.10 and the 3.73 for the same jobs, same driver, and kept track of MPGs. In the weight ranges we're talking about 16-20K, should I expect more than 10% fuel economy differences?
Agreed with you on the model year. recently ive had this growing fear for the new model year vehicles. not that i go screaming to the dealer as soon as they make a change but rather feel sorry for the innocent individual that did, thinking this was the perfect vehicle that will have no problems, only to find out it has different issues than the last one...

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post #10 of 52 (permalink) Old 03-19-2017, 06:54 PM Thread Starter
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Mpg is far more speed (aero drag) dependent than a few hundred rpm difference dependent. Drag multiplies exponentially with mph. Not so with rpm. Years of snow plowing and meticulous fuel records prove it. I can plow snow at highway rpm for 1.6- 1.9 gals per hour. That should equal more than 30 mpg. I get 18-19 mpg or 3-3.6 gals pr hr. consistently on the highway.
3500 DRW CC w/ 4.10?
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post #11 of 52 (permalink) Old 03-19-2017, 07:37 PM
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I have a 2016 3500 with 3.73 with winter blend fuel I get about 8mpg avg per gallon pulling about 20,000 lbs summer blend was 10. When I pull I lock my 68rfe in 5th gear and cruise 65 at almost 2200 rpm. She will pull some pretty steep grades without down shifting. In 6th it will down shift often. I'm planning on deleting next month in hopes of a couple more mpg and no more def I burn about 1/2 tank of def per day.

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post #12 of 52 (permalink) Old 03-19-2017, 08:29 PM
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Originally Posted by tim.rohrer View Post
3500 DRW CC w/ 4.10?
No. Srw with 3.42. Those numbers are also within 1-1/2 % of my 04.5 with 3.73 gear, under the exact same scenario. 385,000 miles on the 04.5 and just under 60,000 on the 2015. I have fuel records going back to 1992 and almost a million miles on Cummins pickups. These include a 92 and a 2002 as well as the ones listed. The first 3 were standards, the 15 has an Aisin. All the trucks performed the same basic duty with remarkably close fuel usage results percentage wise.
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