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Old 01-02-2018, 07:06 AM   #29
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We did that expensive dance too... see below for f-250 to 350 and added ALL the tricks, in cab adjustable airbags, heavy duty anti-sway bars, beefier tires, adjust weights just so...

But still, with a heavy 38GK redwood, it manhandled the SRW 350 too many times...

Only once did I consider it dangerous, but many times definitely uncomfortable !

I mean acceleration with the stock gearing and 6.7 engine moved right along and could even PASS some traffic, but big dips, and stopping was always a concern. I drove very, very, VERY defensively - which made for tiring drives.

Go with the dually !
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Old 01-02-2018, 09:40 AM   #30
Join Date: Dec 2017
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Originally Posted by 2007dura View Post
Mine has the 4.10's. For my 16K fifth wheel, they are overkill. When I was trying to decide, a guy on one of the Ford forums did a chart of RPM's for each gear and the speed.

4.10 DRW

4th gear 55 = 2764; 60 = 3015

5th gear 55 = 2061; 60 = 2248; 65 = 2435; 70 = 2622

6th gear 55 = 1624; 60 = 1772; 65 = 1919; 70 = 2067

Sweet spot for climbing: 64 - 75

3.55 DRW

4th gear 55 = 2393; 60 = 2610; 65 = 2828

5th gear 55 = 1784; 60 = 1946; 65 = 2108; 70 = 2271; 75 = 2433

6th gear 55 = 1406; 60 = 1534; 65 = 1662; 70 = 1790

Sweet spot for climbing: 55 - 64; > 74

This chart is spot on for mine. I live in the mountains and I will drop down to 5th. I like the 4.10's because of the pickup when pulling out and in the mountains if you get stuck behind something you can get back up and going. Towing I am getting in the high 9's and empty running around town low 16's. On interstate unloaded and staying under 65 I can get 18, but go over 65 and mileage will drop.

I had to order mine to get the 4.10's as dealers around me pretty much order 3.55's. This trucks sweet spot for climbing RPM is in the 2400 range so that is where the sweet spot for climbing comes from.

You say the 4.10ís are overkill. Do you wish you had gone with the 3.55 instead?
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Old 01-03-2018, 08:47 AM   #31
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I would go with the 4.10's again. My truck is used for towing only, and I live in the mountains. I like the 4.10's for the added acceleration and pick up. From what I have read of owners with 3.55's, they get a little better milage when empty, about the same towing. With the new HP and torque, along with the power band being raised up from previous models, both gearings are good. If I just towed in the flats and visited mountains every now and then, I would go with th 3.55's for the weight I tow now. If I were to go to a heavier fiver, 19-20K, I would want the 4.10's for the added low end.
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Old 01-03-2018, 09:42 AM   #32
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My '17 DRW has 3.55's because I use it as my daily driver (30 mi to work). Plenty of ability to accelerate going uphill on the east coast when dragging 15K 5th wheel. I get ~16 mpg unloaded and ~9.8 mpg towing. For me, towing with plenty of truck is just a phenomenally fine experience.
2017 F350 SC, 6.7 PS 4x4 DRW
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Old 01-03-2018, 11:22 AM   #33
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Thatís pretty impressive mpg. In my 250, the best I have gotten is 16. Granted, most of the driving I have done is non highway but on the highway, 16 is so far the best I have clocked. Also, the fact that I have only like 1,100 miles on the thing may pay a factor into it.
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