Axle ratios? - Dodge Cummins Diesel Forum
2010-2012 General Discussion General Chit Chat About the 6.7L 4th generation Cummins - NO ADVERTISING

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post #1 of 24 (permalink) Old 05-18-2019, 12:06 PM Thread Starter
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Axle ratios?

So I was on the FCA site, and noticed that 3.73 and 4.10 axles are now available with a Cummins, which didn't make me happy, because my '17 has the 3.42's.
What prompted FCA to pull their heads out and allow these options? Complaints, or other? I know Ford has and GM is going the other direction, but they also have the 10 speed trannies to allow this.

And for you engineer types out there, does running lower gears reduce stress on tranny and other driveline parts, or vice versa?

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post #2 of 24 (permalink) Old 05-18-2019, 01:27 PM
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Quote:
Originally Posted by Desert 2500 View Post

And for you engineer types out there, does running lower gears reduce stress on tranny and other driveline parts, or vice versa?

Thanks
Absolutely, but you donít have to be an engineer, they had the 1st crack at designing the truck. A dumb tradesman advice spending his hard earned dollar can tell you that itís better to.

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post #3 of 24 (permalink) Old 05-18-2019, 02:14 PM
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I buy my trucks for heavy work and lower gears are easier on everything. A lot of the time I wish the 3.73s in my 12 were 4.10s like most of my previous trucks had. Craig

2012 CCLB 4wd dually, 3.73, 68rfe, Fass, Deleted, EFI engine/trans tuning, BD IH SXE 363/80/.91 w/ebrake, 4" turbo back/51" Quiet Tone. DD and tow vehicle.
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post #4 of 24 (permalink) Old 05-18-2019, 03:20 PM
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What's the difference ?

A truck with the 48RFE and a 4:10 gear or a truck with a 68RFE and a 3:42 ?
When I tow with mine, I always shift it with the shift button and run in tow/haul
with the exhaust brake on full tilt.

I can't tell a difference between a 4 speed 4:10 and a 6 speed 3:42.
My 16 makes twice as much power and torque as my 96 did. The new
truck has no problems with the 3:42 as long as you control the trans, IMO!

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post #5 of 24 (permalink) Old 05-18-2019, 09:53 PM
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Guess it just goes to show everybody likes something different!!! I have been driving Cummins trucks since 94' which started with 160 hp. 5.9. I think they finally got their head out of a** by getting rid of 3:42's. They have no place behind the Cummins engine!! IMO
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post #6 of 24 (permalink) Old 05-19-2019, 09:31 AM
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I have an 11 2500 withg56, 3.42s and 37s and towed my buddies 2012 2500 to his shop 40 miles away. My truck handled it great. Overall weight was around 11k.

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post #7 of 24 (permalink) Old 05-19-2019, 03:55 PM
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Mine has 3.73ís, 33ís, an s476 single, and I donít think I could pull this off without at least these gears. Under 1900rpm the empty trailer could pull egts to 1200. Once in 5th loaded at 70mph/2200rpm itís barely broken 1000.
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post #8 of 24 (permalink) Old 05-19-2019, 04:55 PM Thread Starter
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Every reply is absolutely correct.
Will my (our) trucks tow well with 3.42's? Yes. Would we be able to tow the same load even better with 3.73's or 4.10's? Yes.
The higher numerical gearing also provides better acceleration, and less negative effect when going to taller tires.

Still doesn't answer the question as to why FAC went back to the lower gearing?
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post #9 of 24 (permalink) Old 05-19-2019, 06:52 PM
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Maybe it's just me, but with the g56, 3.42 and 37s it alot nicer to drive. Can still start in 2nd, and I dont have to shift as often than when it had the stock tires on it. I do still have the stock rims and tires and I swap them on when I know I'm going to have a heavy tow.

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post #10 of 24 (permalink) Old 05-19-2019, 07:41 PM
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Quote:
Originally Posted by Desert 2500 View Post
Still doesn't answer the question as to why FAC went back to the lower gearing?
With a more powerful engine, they may not have had a choice.

As mentioned above, lower gears take stress off of the drive train (simple physics), so the 10% lower gearing may have been a necessity to keep things behind the engine alive.
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Maybe if we start telling people that the brain is an app, they will start using it?

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post #11 of 24 (permalink) Old 05-19-2019, 08:18 PM
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I dislike my g56 with 3.42s on stock tires. Maybe if I'd never drove a g56 with 3.73s for so many years. 3.73s with the g56 is a torque monster. Not that the 3.43s are horrible just not near the pulling power. Yes these trucks have for more power than the trucks of yester year but leverage is leverage, physics will never change or go away. Lower gears( numerically higher) will always give more mechanical advantage and place less strain on the drivetrain.
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post #12 of 24 (permalink) Old 05-19-2019, 10:31 PM
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The lower stress is huge, and the stock 68 is really spongy when you get down to it. With the amount of power I run having that Durango behind me I blew through the converter 3800rpm, while not accelerating about as quick as with 40% less throttle.

In essence I guess thatís likely the reason that went back to the shorter gears. You start pushing a decent amount of power through them, and youíre just going to make a ton of heat overworking the converter.

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