Highway RPM with G56 and 3.73 - Dodge Cummins Diesel Forum
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post #1 of 11 (permalink) Old 09-11-2019, 09:19 AM Thread Starter
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Highway RPM with G56 and 3.73

Hey everyone. Been searching and lurking for a while now. I’ve got a ‘16 3500 dually with 295/55/20’s and I’m running around 2-2100 rpms at 70 mph. This seems a little high as I have buddies running around 1700 rpms.

Does this seem right? Is an auto trans ratios different from the G56?

What RPM’s are you guys running and is it worth changing to a 3.42?

Thanks

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post #2 of 11 (permalink) Old 09-11-2019, 10:33 AM
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2012 g56 with 4.10's and 35's i run 2000 rpms at 67mph

2012 3500 cclb 6spd manual. Two turbos and other fun stuff that drains the bank.....
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post #3 of 11 (permalink) Old 09-11-2019, 12:15 PM
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g56 has a over drive ratio of .74 and a 68 and asin has a .63 i have a g56 with stock tires and 3.73 rear running same rpm as you.

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post #4 of 11 (permalink) Old 09-11-2019, 01:32 PM
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Yup completely normal with a g56 and 3.73s. If all you seldom do any towing or at least not heavy, 3.42s are great highway gears.

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post #5 of 11 (permalink) Old 09-11-2019, 01:57 PM Thread Starter
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That’s exactly what I’m looking for. Mainly highway miles not pulling a lot. What rpm could I expect with the 3.42’s? Thanks

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Yup completely normal with a g56 and 3.73s. If all you seldom do any towing or at least not heavy, 3.42s are great highway gears.
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post #6 of 11 (permalink) Old 09-11-2019, 07:42 PM
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Put info in here

Gear Ratio Comparison Tool - Compare Axle, Transmission Combinations

2012 3500 cclb 6spd manual. Two turbos and other fun stuff that drains the bank.....
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post #7 of 11 (permalink) Old 09-11-2019, 07:47 PM
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70 for me with a g56 is around 1900 I think. If you really want to know speeds for a given rpm I'll make a note next time I drive the truck. If I could find someone with a srw 3.73 truck I'd swap everything in a heartbeat. Towing heavy with 3.73s is so much more enjoyable imo.

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post #8 of 11 (permalink) Old 09-12-2019, 12:20 AM
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70 for me with a g56 is around 1900 I think. If you really want to know speeds for a given rpm I'll make a note next time I drive the truck. If I could find someone with a srw 3.73 truck I'd swap everything in a heartbeat. Towing heavy with 3.73s is so much more enjoyable imo.
Same here, I pretty much only use the truck for towing 26k-30k lbs on average and would love to have 3.73 vs my 3.42, plus backing up would be bearable with 3.73. The reverse gear is almost as tall as 2nd, I would like to know what idiot decided the reverse gear need to be that tall?
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post #9 of 11 (permalink) Old 09-12-2019, 01:40 AM
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Same here, I pretty much only use the truck for towing 26k-30k lbs on average and would love to have 3.73 vs my 3.42, plus backing up would be bearable with 3.73. The reverse gear is almost as tall as 2nd, I would like to know what idiot decided the reverse gear need to be that tall?
BD 2-Low kit is the way to go.

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post #10 of 11 (permalink) Old 09-12-2019, 08:07 AM
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Even with 3.73s backing up with a heavy trailer is rough. Still to fast to back into a tight spot. 2lo is really to only answer for that. I dont know why we need to be able to go 20 mph backwards
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Truckasaurus - 2010 2500 CCSB -sold
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post #11 of 11 (permalink) Old 09-12-2019, 11:09 AM
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You guys are correct about the 2w low but I have a one of those 2wd trucks that almost don’t exist lol. It’s a tow rig and I got a killer deal on it. Couldn’t be to picky
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