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Old 01-25-2016, 08:57 PM   #1
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Buying a 2016 Dodge Dually 3500

I wanted to know anyone's thoughts on the rear end ratio of the new trucks. It seems that they come standard with a 3.42 ratio rear end and I have seen some posts of owners having 4.10's ,etc. Is the lower gear ratio necessary? Need to buy one soon but didn't pay attention to the gear ratio on the lot trucks until now. Do I have to special order the truck to get a 4.10?

I am purchasing a Bighorn 3875 FB that is 14522# dry weight.
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Old 01-25-2016, 09:38 PM   #2
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Very happy that I went with 4.10's on ours. It's nice to have more capacity than needed, especially when going up hills.
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Old 01-25-2016, 09:41 PM   #3
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The towing capacity is largely determined by differential ratio. You don't care about dry weight unless you plan to tow it that way. Use the gross vehicle weight when determining what size truck to purchase for towing.
This 5th wheel towing caclulator will help you properly and safely match a truck to your trailer.

FYI, I had a Dodge 3/4T CTD that I switched from 3:42 to 4:10 diff. ratio. Actually the truck pulled better before the switch, and of course got much better mileage. The 4:10's caused the Cummins engine to rev higher at 65 MPH, it sounded like was coming out of the truck, I forget the exact rpm's, something like 2,000-2,200. Eventually I accepted the fact I had too much trailer for my truck and traded for a new dually.
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Old 01-25-2016, 09:45 PM   #4
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Typically a 3:92 or 4:10 is the better gear ratio for towing.
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Old 01-26-2016, 01:35 AM   #5
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If you can find a Ram 3500 withe Aisen Trans and the 4:10....when I bought mine had to have it brought down from out of state because there was not one in Texas.....at the time I was purchasing.....you will find more with the 3:73 than the 4:10 but the 4:10 and Aisen combo is hard to beat....kinda think better to have more then not enough...

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Old 01-26-2016, 09:18 AM   #6
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I wanted to know anyone's thoughts on the rear end ratio of the new trucks. It seems that they come standard with a 3.42 ratio rear end and I have seen some posts of owners having 4.10's ,etc. Is the lower gear ratio necessary? Need to buy one soon but didn't pay attention to the gear ratio on the lot trucks until now. Do I have to special order the truck to get a 4.10?

I am purchasing a Bighorn 3875 FB that is 14522# dry weight.
Since you did not specify what type of Ram you are purchasing, I have chosen a generic truck. A crew cab long bed 4X2 DRW truck with the 6.7L Cummins and the 6 Speed Aisin transmission. All of the basic weights for this truck are the same regardless if you have a 3:42, 3:73 or 4:10 differential installed in the truck. The only differences being are the GCWR and Max Trailer weight rating for the different differential ratios. For a good compromise between the 3:42 and the 4:10 gear sets I would suggest using a 3:73 differential ratio. The GCWR for the 3:73 is 33,800 LBS and the Max Trailer Weight rating is 25,360 LBS. This will be more than enough to pull most 5ers that are being sold and still provide some fuel economy for you.

I have also included a link to the Ram Body Builders Guide that this information was obtained from.
http://www.rambodybuilder.com/year.pdf
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Old 01-26-2016, 10:09 AM   #7
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I am also looking into a new Dodge Ram as a tow vehicle. Just a thought... A new ram 4 door cab and chassis 5500 is way cheaper ($20k or so) than a 4 door 3500 DRW.
My plan is to go with a 5500 and add on a new skirted flatbed for another $5k. With a 5500 you get the Aisen tranny, bigger brakes, 4.40 gears and 19.5" tires. The 5500 interiors are very nice with power windows, etc although you get rubber floor instead of carpet (which I prefer).
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Old 01-26-2016, 10:28 AM   #8
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Depending on what you're towing would be the determining factor for gear ratio. If your towing north of 12-13,000 IMO I'd go 4.10 Aisin. The Aisin has better 1-2 gears. I have 3.73s in my 12 2500 CTD and can't imagine having 3.42s. I know the 13 and up Rams are rated higher with the 3.42s, but they also come with larger dia tires. Those two factors make you run real low rpms when cruising in the 55-65 mph range. Ram has the same gear ratios in the 2012-2016 68RFE. My 3.73s give a good tow-non tow rpm range. 4.10s would be better for towing. If your towing a lot then 4.10s are the way to go with heavy trailers. If you only occasionally tow then you could get by with 3.73 or 3.42. Your trailer weight will also determine what you need. Also where are you towing? Mainly mtns or flat? On the flats you can get by with 3.42. If you plan on doing lots of mtn hill towing then 4.10 would be better.
If moneys no object then 4.10 with the Aisin. But in the end it's about your trailer weight.
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Old 01-26-2016, 11:17 AM   #9
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When I bought my Ram it came with 4.10s. Was not sure I wanted them, but.... after owning it and towing my fiver I actually am now goad for them. I can tow all day at posted speed limits with the cruise control and enjoy the trip. I actually getmbetween 10.5 and 11.5 MPG towing, so sacrifice? No, at least not in my opinion.
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Old 01-26-2016, 11:39 AM   #10
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I have the '15 Ram 3500 dually 4x4 crew cab. It has the 3.73 gears with the Aisin transmission and is rated to tow up to 23,500 pounds. My camper weighs in at 18,600 pounds and the truck pulls it easily.
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Old 01-26-2016, 12:40 PM   #11
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I have towed heavy with both 3.42 and now 4.10's. Last 11 HO RAM Dually combined 29K I towed in 5th the same rpm's as if it had 4.10's. Only negative was you had to take it easy getting the load rolling especially on a grade. It had the 68RFE trans.

I now tow 32,500# combined with 15 Dually with Aisin and 4.10's. It's AMAZING how easily the load gets rolling even on a grade. My Son has a Limited 3500 SRW with Aisin and 3.42's. I have towed it with a HEAVILY loaded dump trailer and was impressed at how easy the Aisin with it's lower starting gears got the load rolling.

So it's my opinion that if you are buying a RAM Dually you should get the Aisin for sure!!!

Now for the gearing I personally think the 3.73 is not needed at all. Towing up to 28K combined or so I would get the Aisin with 3.42's and tow in 5th at 1,750 RPM at 60 and enjoy the benefits of 6th gear while driving solo for some improved mileage.

Anything 29K and over combined I HIGHLY recommend 4.10's with Aisin.

I also HIGHLY recommend the factory rear air ride it is AWESOME. It rides good loaded as well as unloaded. Truck rides same either way as far as stance. See Below, 9,580# sitting on the 4 rear tires.


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Old 01-27-2016, 01:13 AM   #12
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Found the one......

OK all! First off thanks for all the information about the specs. Found a truck that came off the delivery truck an hour before we bought it. We had to giggle, thr plastic was still wrapped on the seats and the truck wasnt prepped yet! We are now the proud owners of a Ram 3500 DRW Longhorn Laramie 4x4 with a 3:73 rear end and the Aisen transmission.

#Cummins12v98 - Truck looks identical to yours! White with tan trim.

Now off to the custom shop for air bags and accessories.

Pics coming as soon as we get the trailer and truck together.
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Old 01-27-2016, 01:27 AM   #13
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Quote:
Originally Posted by Modelo View Post
OK all! First off thanks for all the information about the specs. Found a truck that came off the delivery truck an hour before we bought it. We had to giggle, thr plastic was still wrapped on the seats and the truck wasnt prepped yet! We are now the proud owners of a Ram 3500 DRW Longhorn Laramie 4x4 with a 3:73 rear end and the Aisen transmission.

#Cummins12v98 - Truck looks identical to yours! White with tan trim.

Now off to the custom shop for air bags and accessories.

Pics coming as soon as we get the trailer and truck together.
If you got the 6.7L IL-6 CTD the 3:73 Rear end will work fine. I am waiting for my 2016 Laramie LB/CC SRW IL-6 CTD to get here.
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Old 01-27-2016, 01:47 AM   #14
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WHY air bags?
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