Best ring & pinion set? - Page 3 - 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 #25 of 36 (permalink) Old 06-27-2019, 09:38 PM Thread Starter
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Thanks again, Speciulboy. I plan on driving empty for 3 weeks before making our next trip.
I know going to 3.73's won't make much difference, except in one area. When towing our fiver, 150 - 200 rpm higher will allow me to cruise more often in 6th on the interstate here in the Rockies. Big difference in MPG.


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post #26 of 36 (permalink) Old 06-28-2019, 12:03 AM Thread Starter
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Originally Posted by kylant View Post
I have an '18 3500 SRW with Aisin. currently running 285/75-18s (35's). I want to regear with 4.10s. Will this be too low of a gear with 35s and the Aisin? I think next tire will be a 37" though
thanks
Plug the numbers into this calculator and see.

Gear Ratio Calculator

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post #27 of 36 (permalink) Old 06-28-2019, 12:15 AM
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Originally Posted by Desert 2500 View Post
Plug the numbers into this calculator and see.

Gear Ratio Calculator
looking for input from folks who have actually done this.
thanks

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post #28 of 36 (permalink) Old 08-25-2019, 01:26 AM
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I been using Motive gears in several of my towing trucks and been having good results. Used Yukon gears several times and I do not like them as they made are in China and do not hold up. Motive made in Italy and have a much better forging and heat treating that hold up like the old Richmond gears did years ago.
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post #29 of 36 (permalink) Old 08-25-2019, 09:43 AM
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Originally Posted by kylant View Post
looking for input from folks who have actually done this.
thanks
4.10 is more than enough for 33ís 35ís and 37ís

I have a SRW and swapped to 4.10ís. I had 37ís but have since dropped to 33ís. Zero regrets. Transmissions love high rpm no matter if itís Alison, RFE, or Aisin.
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post #30 of 36 (permalink) Old 08-25-2019, 12:26 PM
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4.10 is more than enough for 33ís 35ís and 37ís

I have a SRW and swapped to 4.10ís. I had 37ís but have since dropped to 33ís. Zero regrets. Transmissions love high rpm no matter if itís Alison, RFE, or Aisin.
are there any tuning differences for the different gear ratios in trucks that have the Aisin?
For example, does a truck with 3.42 have a different tune compared to truck that came with 4.10s?
thanks

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post #31 of 36 (permalink) Old 08-25-2019, 03:05 PM
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Originally Posted by kylant View Post
are there any tuning differences for the different gear ratios in trucks that have the Aisin?
For example, does a truck with 3.42 have a different tune compared to truck that came with 4.10s?
thanks
No. Only because the aisin cannot be tuned.

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post #32 of 36 (permalink) Old 08-25-2019, 07:40 PM
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The shop where I had mine regeared said that he recommended AAM gears over the Yukon because the AAM gears would run quieter in the trucks. I did 4.10's and I run about 1800rpm's at 70 empty with a 68RFE. Truck runs strong now and trans doesn't hunt gears or struggle in the hills while towing.
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post #33 of 36 (permalink) Old 08-25-2019, 08:35 PM Thread Starter
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We’ve made two trips pulling our 5th wheel, first 500 miles, second 1100 miles. So far, I’m very satisfied with the gear swap.
I’m seeing improved towing, which you would expect, but also slightly better MPG, (>0.5 increase), the latter probably a result of holding higher gears longer when climbing.
As far as the country of origin for the Yukons. My rear set was made in America, front set in China.

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post #34 of 36 (permalink) Old 08-25-2019, 08:41 PM Thread Starter
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My installer said he didn’t recommend AAM, so who knows?
Couldn’t find any Richmond for my application.
Most Yukon gears are made in Chicago by US Gear.

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post #35 of 36 (permalink) Old 08-25-2019, 09:05 PM
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I’m on my third set of g2 gears. 2014-4.56 , 2017-4.56 , 2018-4.10’s

Everybody and their momma is brand loyal. Just pick one

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post #36 of 36 (permalink) Old 08-27-2019, 12:51 PM
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Quote:
Originally Posted by Desert 2500 View Post
I am gearing down my '17 from the 3.42's to 3.73's to better tow our fiver. The tech I spoke with who does a lot of swaps for Jeeps recommended Richmond's over OEM parts.
Any input either way or a different maker would be appreciated.
Thanks
I swapped mine from 3.42 to 3.73 a few months ago, 18 2500 2WD.
Used the OEM gearset p/n 68237849AB, don't know the p/n for the front.

Reason I did it is so I could tow our 5th wheel trailer in 6th gear @60-65 mph without lugging the engine on those long flat stretches of hwy.
I'm a retired heavy duty line mechanic from the 70's and swapped the gears myself.

Also, don't forget to re-configure the BCM to reflect the gear ratio change.
A gear ratio change does not affect speedometer, but it does affect torque management in the PCM. Easy to do using AlfaOBD.
There is a discussion about this on the turbodieslregister
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