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Old 09-27-2011, 10:15 PM   #15
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I"ve got a 2008 3500 with 3.73 rear and the 6 speed auto with a 15K# fifth wheel. Took it from Houston to northern Ohio and didn't find a hill it wouldn't pull in 5th gear at 65MPH if I downshifted manually. I'll admit to deliberately routing around Covington, KY/Cincinatti, OH... On the flats, it will run 70 in 6th gear. All that said, if I was in the Rockies, I'd get the 4.10 rear end.
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Old 09-28-2011, 08:41 AM   #16
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Not that it really matters since you're all talking Dodge, but with GM, Duramax, and Allison the only ratio avail is the 3.73s. I'm pulling 14.9K (was just weighed) and can cruise at 64 to 66 in 6th and will take typical smaller grades without downshifting. Very, very seldom have I found anything where it needs to drop all the way to 4th (1:1)
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Old 09-28-2011, 08:49 AM   #17
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Not that it really matters since you're all talking Dodge......
Ummmm.....right. As the thread title indicated, this thread is Dodge-specific since it's dealing with the interplay of the 4.10 axle ratio with the gear ratios of the 68RFE double overdrive automatic transmission.

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Old 09-28-2011, 08:55 AM   #18
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Rusty,
Quick look at Edmunds list 3.42/3.72/4.10 available in both 4x and 2x--are there any restrictions on engine/trans combos that change the axle choices?
Asking you since you are the resident Dodge guru...
Joe
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Old 09-28-2011, 09:03 AM   #19
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Nope. You can get the Cummins with 68RFE automatic with any of those three axle ratios - 3.42, 3.73 or 4.10. The 3.73 is the "standard" ratio you'll most often find on the dealer's lots. If you select the MaxTow package for the maximum GCWR and trailer tow ratings, however, you get the 3500 DRW with 4.10 axle ratio. GCWRs are dramatically lower for the 3.73 and lower yet for the 3.42. For our truck configuration (see signature), the GCWRs are 26,000 with the 4.10, 21,000 with the 3.73 and 17,000 with the 3.42 as taken from the Dodge body upfitters' guidelines.

As a point of fact, the couple that owns our RV storage lot has a 2011 Ram 3500 DRW with the Cummins, 68RFE and 3.42 axle. That's certainly not the ratio I would have chosen for my purposes, but he commutes across Houston daily in the truck and wanted that specific axle ratio for fuel economy purposes, even though they will haul a large Lance truck camper and pull one of their antique cars on a trailer behind it when they go across country to car shows. I imagine he spends a lot of time in 5th or even 4th gear with the 3.42 rear gears when he's loaded and towing.

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Old 09-28-2011, 09:47 AM   #20
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Rusty,
Thanks. At least Dodge seems to give more choices in the 3500s than Ford or Chevy.
My condolences to anyone who has to commute 'across' Houston--what a tough traffic situation.
I actually think he would spend less time in lower gears than you would expect--my 450 w 4.30 gears will pull overdrive (granted, it is a single overdrive) at very low speeds under quite a load. And it is my daily driver, also.
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Old 09-28-2011, 10:00 AM   #21
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I actually think he would spend less time in lower gears than you would expect--my 450 w 4.30 gears will pull overdrive (granted, it is a single overdrive) at very low speeds under quite a load. And it is my daily driver, also.
Joe, with the 4.10s, we cruise in 6th at only 1750 RPM @ 65 MPH. With the 3.42s, he would be down at 1460 RPM @ 65 MPH. That's probably going to call for a downshift (or two) on any meaningful grade if he's loaded and towing. The double overdrive gearing in the 68RFE really lets the Cummins loaf in 6th gear on the flats for relaxed cruising and better fuel economy, but the PCM doesn't mind calling for a downshift to kick the Cummins up into its 2000-2200 RPM sweet spot if needed when towing in the tow/haul mode.

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Old 09-28-2011, 11:26 AM   #22
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Looks like I need a 6th gear--I am turning 1900 at 62. I did recently find out I could maintain cruise at 80@2700 and still get 11mpg. Truck is governed at 82--that is a weird feeling, more pedal, nothing happens.
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Old 09-29-2011, 09:33 AM   #23
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Here are the specs for the 2012 2500 and 3500 models.

http://www.media.chrysler.com/dcxms/...2500Towing.pdf


http://www.media.chrysler.com/dcxms/...3500Towing.pdf
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