Those who did the 4.10 upgrade - need your input - Dodge Cummins Diesel Forum
2013-2018 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 29 (permalink) Old 05-21-2019, 08:52 PM Thread Starter
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Those who did the 4.10 upgrade - need your input

Any regrets doing this upgrade from 3.42's?

I pull a trailer from time to time and it's my daily driver.

I have the 68RFE trans and I'm on true 35" tires (295/65r20)

I know my top speed will suffer greatly but I rarely go over 75 anyways.


If you could do it again, would you?


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post #2 of 29 (permalink) Old 05-21-2019, 09:38 PM
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I think 3.42ís to 4.10ís is a big enough jump to be cost efficient. That ratio feels perfect with 35ís and will be like driving a new vehicle especially when towing. I had 35ís for a year and then went to 37ís. Itís kind of back to being a dog with 37ís but the 35ís were great. I have a 32í gooseneck and it definitely much nicer with the gear change. Look at spending +\-$1k for each axle with parts and labor.


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post #3 of 29 (permalink) Old 05-21-2019, 10:03 PM
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I went to 4.10's a couple of months ago,it's a mixed bag of pluses and minuses. I am running a 315/70/18 tire,weigh around 9600. When I was still using stock gearing 4th gear was perfect,59MPH~2K,5th gear 70MPH~2K was perfect for me as well.
I could only use 6th on the interstate around 74,I am only on the interstate a few times a year.
After the gear change 5th is about the same as 4th was, but about 1 to 200 RPM higher for the same speed.
It's turning a little faster than I would like, but I knew this going into it. Now 6th is usable at 65 MPH,the big minus for me is my local 7% grade.I used to roll up in the left lane 70/2K,now I have to run ~2.5K in 5th,it doesn't have the power to run that grade in 6th.I don't want to push it that hard so I am running 21K in the center lane.
Other pluses,much better on dirt roads as I am in 2/3 instead of 1/2.Low range feels like a low range should,well almost,it still doesn't really crawl like a manual.
I may go to 37's someday,this may put 5th in a sweeter spot RPM wise.

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post #4 of 29 (permalink) Old 05-22-2019, 01:07 AM
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I am interested in this as well. Switched to 35ís and tow 10k on occasion. Would love lower gears but wandering if the freeway traveling empty is going to suffer much


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post #5 of 29 (permalink) Old 05-22-2019, 08:32 AM
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Something I’ve been looking at for a long time now.. still up in the air about trying the install myself or having it done. The 3.42’s aren’t adequate even with stock tires imo, and never should have been offered in a HD truck.

Did you guys have a shop do it?
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post #6 of 29 (permalink) Old 05-22-2019, 10:48 AM
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Given the ratios of the modern transmissions, I see no problem with going with 4.10s. Your final drive ratio will still be higher than mine with the G56 and 3.73s. I probably wouldn't go deeper than that, but you should have no problem with the 4.10s even with stock tires.

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post #7 of 29 (permalink) Old 05-22-2019, 10:59 AM
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Quote:
Originally Posted by SoCalAdam View Post
I know my top speed will suffer greatly but I rarely go over 75 anyways.
Why do you think that your top speed would suffer, let alone greatly?

I'm fairly certain that our Rams are speed limited because of the tires, and with 4.10s you'll end up with a 20% higher rpm at that speed, that's all.

Maybe if we start telling people that the brain is an app, they will start using it?

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post #8 of 29 (permalink) Old 05-22-2019, 11:34 AM
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Just picked up a new 2018 3500 and am definitely interested in this discussion. The stock gearing is terrible, even with the puny stock tires it seems. It seems like leveled and 34-35" tires with 4.10s would be ideal for the 68rfe.


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post #9 of 29 (permalink) Old 05-22-2019, 12:25 PM Thread Starter
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Quote:
Originally Posted by Jimmy N. View Post
Why do you think that your top speed would suffer, let alone greatly?

I'm fairly certain that our Rams are speed limited because of the tires, and with 4.10s you'll end up with a 20% higher rpm at that speed, that's all.
At 80MPH, according to the calculator, RPMs will be 300 higher at the same speed.
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post #10 of 29 (permalink) Old 05-22-2019, 02:19 PM
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I had a '15 megacab with 37's and 4.10's. It was perfect for me. Roll-out was similar to stock tires with a 3.55-ish ratio. Towed my 14k toy hauler and 7700 lb boat no problem, and unloaded it was like driving a stock truck.

I now have a '17 with 3.42's and 35's (but with an Aisin trans). I couldn't imagine wanting 4.10's with 35's unless you're looking to tow in 6th gear. RPM's would be just too high for unloaded driving. Especially in states where people average 80mph (CA, Texas, AZ etc).

Top gear ratios are the same in both transmissions at .63:1

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post #11 of 29 (permalink) Old 05-22-2019, 02:44 PM
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...I now have a '17 with 3.42's and 35's (but with an Aisin trans). I couldn't imagine wanting 4.10's with 35's unless you're looking to tow in 6th gear. RPM's would be just too high for unloaded driving...
my '18 with Aisin, 3.42s, and 35s is a dog. it can't hold 5th gear unloaded driving the mountain passes around here.

my 2011 came from the factory with 4.10s and it was way better.
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post #12 of 29 (permalink) Old 05-22-2019, 02:51 PM
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I also had 3.42 and went to 4.10 and heres my thoughts. I have 34.5" tall tires.

The truck drives so so much better in the city accelerating after lights and such, for sure a reduced load on the 68RFE.

For towing light loads like motorsports toys (5000 lbs and less) the truck is a million times better with the higher rpm I can cruise along in 6th and get very good fuel economy.

Towing heavy obviously the 4.10 is easier to get a heavy load up to speed but when in 5th its fast enough when nearly maxing the truck out weight wise. And if you come to a steep hill you can climb in 4th and not be too slow and the truck will make the hill with ease.

It's the medium loads that can put you in an odd spot, the truck will tow it in 6th but I'm worried the junky 68 will slip with a load in 6th but in reality it's no different than being in 5th from before so maybe it dont matter.

Since I've done the 4.10s I no longer have any big trailers just a sled deck and a 6x12 for my side bt side, so 4.10s are a little overkill and maybe 3.73 would be more ideal for lighter loads and best fuel economy while empty.

That said 3.73 or 4.10s are all better than 3.42s.. the new 5th gen with Aisin and 3.73 sure is a beast with the lower 1st gear of the Aisin. Even if a swap to 3.73 were free I'd still keep the 4.10s just incase I ever get a big raise and decide to add performance goodies.

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