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Old 02-26-2016, 04:44 AM   #29
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I pull a 18000 lb 5th wheel and have no problems with 373 gears. 11 mpg towing and 16.5 highway at 80 mph. I have bags installed and you can set them to where the ride is excellent with the weight
80? Seriously? How many blowouts have you had so far?
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Old 02-26-2016, 07:55 AM   #30
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80? Seriously? How many blowouts have you had so far?
none. for one thing 80mph empty non towing. speed limits in Arizona are 75 and at 80 everyone including semis are passing me. I run from 60 to 70 towing depending on speed limit h rated 17.5 trailer rubber
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Old 02-26-2016, 10:27 AM   #31
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80? Seriously? How many blowouts have you had so far?

Utah allows 80 MPH for all vehicles on the interstate. My trailer has speed rated tires at 75 MPH, but I only drive at 65MPH max. My fuel mileage suffers when I am above 65; so this is what I drive at. I am in the right lane and they can pass me in the left lane with no issues.

I get there when I get there.
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Old 02-26-2016, 12:19 PM   #32
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Put air bags on mine. It really smoothed out the ride.

So did I! It just took checking one box at time of ordering.

One of the best options out there, truck sits level no matter what the load up to max RAWR.

9,580# sitting on rear axle in pic.


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Old 02-26-2016, 12:23 PM   #33
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There are benefits of each. 3.43 will give you the best gas mileage of the three. but the lowest towing ability. 4.10 gives the highest towing but lowest mileage. The 3.73 is a compromise between the other two.
Not really! I have towed HEAVY with both. 29K combined 68RFE 3.42's towed in 5th same rpm as 6th with 4.10's. Now with the Aisin available I would advise 3.42's up to 27-28K and over that 4,10's.

Towing at 60 is 1,750RPM with 3.42's in 5th and 4.10's in 6th. Perfect RPM's.
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Old 02-26-2016, 12:26 PM   #34
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I pull a 18000 lb 5th wheel and have no problems with 373 gears. 11 mpg towing and 16.5 highway at 80 mph. I have bags installed and you can set them to where the ride is excellent with the weight

Hand calc? Over several tanks? Average of all conditions?
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Old 02-26-2016, 12:51 PM   #35
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none. for one thing 80mph empty non towing. speed limits in Arizona are 75 and at 80 everyone including semis are passing me. I run from 60 to 70 towing depending on speed limit h rated 17.5 trailer rubber
Ah, thanks. I get it now.
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Old 02-26-2016, 01:23 PM   #36
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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).
You must be comparing a loaded 3500 to a low-content 5500.

According the Build-Your-Own at the Ramtrucks.com,

A 3500 crew cab DRW Tradesman starts at $45,230.
A 5500 crew cab DRW Tradesman starts at $50,690, and you still need to buy a bed.

The 3500 with the Aisin and the 4.10 also has a greater GCWR than a 5500. The top Cummins in the 3500 is rated at 385hp/900lb-ft, while the 5500 gets 325hp/750lb-ft.
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Old 02-26-2016, 02:41 PM   #37
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I just bought a '14 3500 CCLB, with the 68RFE and 3.42's... If I could have picked I think I would have gotten the 3.73's, but we stay mostly around the midwest and the 5er we are planning on will be only 12k-13k so I think we will be fine... The 800lbs of torque should get her rolling on the ol' flat prairie.
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Old 02-26-2016, 03:22 PM   #38
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So did I! It just took checking one box at time of ordering.

One of the best options out there, truck sits level no matter what the load up to max RAWR.

9,580# sitting on rear axle in pic.

Cummin12V98, I have not seen a 3500 with factory air, is it full air bag suspension, or are the airbags helpers and it still has leaf springs? Thanks!
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Old 02-26-2016, 03:40 PM   #39
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Cummin12V98, I have not seen a 3500 with factory air, is it full air bag suspension, or are the airbags helpers and it still has leaf springs? Thanks!

The bags are carrying the load and keep the ride height consistent. The leaf springs are for axle placement, axle wrap and control. There are two leafs rear and two forward of axle so they really don't carry much weight.

Another thing I like is the stock ride height is lower at the rear than regular sprung trucks. When in Alt trailer ride height the truck sits the same with or without a load.
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Old 02-26-2016, 11:04 PM   #40
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I just bought a '14 3500 CCLB, with the 68RFE and 3.42's... If I could have picked I think I would have gotten the 3.73's, but we stay mostly around the midwest and the 5er we are planning on will be only 12k-13k so I think we will be fine... The 800lbs of torque should get her rolling on the ol' flat prairie.
You will have no problems. We have a 14 same setup pulling 14500 5th wlheel loaded total gross 23500 . Live out west and pull alot of mtn grades does a great job. The 68rfe in 5th is the same as 373 in 6th. You will love it !
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Old 02-27-2016, 07:11 AM   #41
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"The 68rfe in 5th is the same as 373 in 6th."

Not calling you a liar, I have towed with both. The 3.42's in 5th are the same as 4.10's in 6th.

First pic 4.10's in 6th. 60 at almost 1,750RPM.

Second pic adjust speed down to 60 and RPM's would be similar to first pic at around 1,750RPM's. Second pic is 3.42's in 5th.


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Old 02-27-2016, 07:30 AM   #42
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For 68RFE, 5th is 0.816, 6th is 0.625

4.10 x 0.625/0.816 = 3.14 ---> actually a bit steeper than the 3.42.

3.42 x 0.816/0.625 = 4.47 ---> deeper than 4.10 or 3.73.

For AS69RC, 5th is 0.77, 6th is 0.63
4.10 x 0.63/0.77 = 3.4 ----> effectively same as 3.42
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