gears for 35s and towing/DD - 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 22 (permalink) Old 11-18-2019, 08:04 PM Thread Starter
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gears for 35s and towing/DD

Looking for some gearing advice with 35" tires. My camper weighs out around 16K lbs. I just towed for 2 weeks up the smokies and west virginia. The 3.42s towed OK, even up the 5% grades in 4th gear. However, the truck was in boost most of the time I was towing. And taking off from a stop light or starting uphill was questionable.

Would 4.10s be pushing it on the gears and 35s if I am not always towing, or is a 3.73 sufficient. We plan to tow out west next year and I don't see the 3.42s holding the steeper grades.


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post #2 of 22 (permalink) Old 11-18-2019, 08:12 PM
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4.10s w/35s= perfection.


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post #3 of 22 (permalink) Old 11-18-2019, 08:41 PM
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well the duallys with 4.10s come with tiny 31" tires so 35's would lower the rpms a little more.

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post #4 of 22 (permalink) Old 11-18-2019, 08:53 PM
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i really like the 4.10s with 35s. i just had them installed a few weeks ago.
i don't think rpms are too high. 1900 at 75mph if I remember correctly
don't know if I will go up to 37s or not.

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post #5 of 22 (permalink) Old 11-18-2019, 09:04 PM
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3.73’s with 35’s should be a good sweet spot for pavement princesses and economy but if towing you’d want 4.10’s I think

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post #6 of 22 (permalink) Old 11-18-2019, 09:17 PM
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4.10 if you tow alot no question. 3.73's are perfect for me but I pull tractors around and a racecar or two occasionally. if I pulled a travel trailer around for any amount of time, I'd regear to 4.10's right away.

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post #7 of 22 (permalink) Old 11-19-2019, 09:13 AM Thread Starter
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We take the camper out probably 4-5 times a year. Most of the time it's a pavement princess, although in summer I am usually driving one of my other cars so it's more of a winter beater I guess.

Would 4.10s let me safely tow in 5th? I already had Dodge replace the transmission once under warranty @ 45K miles. I assumed it was from towing the old travel trailer in 5th too much.

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post #8 of 22 (permalink) Old 11-19-2019, 11:46 AM
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When I had my 14 with 35's and 3.42's I'd tow in 5th, I locked out 6th and let it go. Now I have an 18 with 4.10's and will eventually put 35's on it. Currently in 6th at 70 mph I'm about 1975 rpm with the 31" stock dually tires. I'd say 4.10's would be perfect.

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post #9 of 22 (permalink) Old 11-19-2019, 08:55 PM
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I take it you're asking about a new truck - not changing gears in your present truck. Your transmission choice makes a big difference. 1st gear in the aisin is much lower than first in the 68. So if you're happy with your upper gear ratios which are close in the 2 transmissions look at the aisin before you commit.

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post #10 of 22 (permalink) Old 11-20-2019, 09:08 AM Thread Starter
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Quote:
Originally Posted by nlol View Post
I take it you're asking about a new truck - not changing gears in your present truck. Your transmission choice makes a big difference. 1st gear in the aisin is much lower than first in the 68. So if you're happy with your upper gear ratios which are close in the 2 transmissions look at the aisin before you commit.
This is for my current truck with the 68. And 1st gear I am not as worried about as cruising speed/gear.

According to grimjeeper.com my current truck should be turning 1421rpms @ 70. I am turning closer to 1500, but the tires are half worn, so it's possible it picked up a few rpms from that.

3.73 is 1550 rpm
4.10 is 1703 rpm

I am towing @ 2000 rpms now in 5th on flat roads. 5th with 4.10s would just up 2220 rpms which is getting a little high for long distances. I assume in the mountains I would want to hold 4th like I have been, which is 2750rpms @ 70 vs 2300rpms with the 3.42 which felt comfortable to me.

I will mess around dropping gears on the way home and see how the rpms effect the engine noise unloaded. I feel somewhere around a 3.90 gear would be perfect.

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post #11 of 22 (permalink) Old 11-20-2019, 04:29 PM
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I got a g56 so bit different but heavy loads I tow in 5th max. Little over 2000 rpm all day long. No issues .I wish I had 410s so 6th gear was a little more useful

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post #12 of 22 (permalink) Old 11-20-2019, 06:11 PM Thread Starter
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I have already blown 5th and 6th on my first 68 So I am a little gunshy about towing in the OD gears. I also keep the boost at stock levels when in OD gears now too, which may or may not had done it.

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