DRW - 3.55 vs 4.10 - Diesel Forum - TheDieselStop.com
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post #1 of 16 (permalink) Old 07-14-2019, 05:19 PM Thread Starter
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DRW - 3.55 vs 4.10

Thinking of moving up to 19 F350 Dually trading a 13 DRW with 3.73 rear axle. Just curious thoughts on 3.55 vs 4.10 axle. I do not see a option for a 3.73. Little concern with fuel mileage if i go with 4.10 which is what most inventory shows around Raleigh, NC.



I understand the axle / wheel rotation multiplier with 3.55 - 3.73 - 4.10 and its effects on engine RPM's. Just curious what real world experience is with the 2017 and up truck owners.


I average towing 10-11 mpg with 2013 DRW 3.73 axle. Thinking a 4.10 will be 9 -10 mpg? Not sure what a 3.55 axle would give me.


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post #2 of 16 (permalink) Old 07-19-2019, 05:04 PM
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What do you tow? That could help. If you are under 10k, then I think you could do 3.55's, but anything heavier and I would consider the 4.10's. I am surprised they don't offer the happy medium 3.73

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post #3 of 16 (permalink) Old 07-20-2019, 02:10 PM Thread Starter
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I will be towing a 17-k to 18-k filth wheel RV. Will most likely settle on the 4.10 axle.




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2013 F350 CC 4x4 DRW 6.7 Lariat Ultimate package.
2013 Heartland Bighorn 3610RE Fiver

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post #4 of 16 (permalink) Old 07-21-2019, 11:05 AM
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I'll let those who tow that heavy to weigh in on this, but I would tend towards the 4.10's as well, after I made absolute sure the 3.73's were not avail.

2017 F-350 CCSB 6.7L
[old]2002 7.3L PSD, 6spd, 4x4 Off-Road, Super Cab, Short Bed, ARE Topper, SCMT Autometer gauges, Tymar, 4" SS aero-turbine exhaust, & WW.

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post #5 of 16 (permalink) Old 07-21-2019, 11:48 AM
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WHen I go to ford.com and configure I see 3.55, 3.73 and 4.10 for DRW F350 diesel

2015 F350 Platinum Max Tow What a beast with the 4.30 gears!
2006 F450 CC Hauler bed 4x2 6.0 L 6.0 auto, Lariat, 4.30 r/a, SCT, 4in exh. 103K New heads to repair diesel in coolant, 148K.
2006 F350 Lariat CC Dually 4X2, 6.0 auto 4.10 LS, SCT, airbags, 4 in. exh. 154K Rebuilt engine to repair damage from burned piston. One head to fix fuel in oil problem.
36 feet on the floor Elite/Outlaw LQ horse trailer.
35+5 foot double tandem axle flatbed trailer.
36 foot double tandem axle flatbed trailer
36 foot Platinum 6 horse LQ, side load, full width back tack
2003 EB Expedition 171K (no engine repairs, gas burners are the new longevity leaders)
2004 Volvo V70R AWD-high miler in fleet, 253K (no engine repairs) Hail totaled it but I kept it. Looks like a golf ball now.
Suzuki Carry KEI truck, 660cc 3 cyl DOHC EFI 4X4 5 speed RHD. Sort of a Smart Car sized pickup. Eats Gators and Mules for lunch.
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post #6 of 16 (permalink) Old 07-21-2019, 03:01 PM Thread Starter
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Originally Posted by jimmy View Post
WHen I go to ford.com and configure I see 3.55, 3.73 and 4.10 for DRW F350 diesel

6.2 Gas engine 3.73 is avail. Diesel's are 3.55 or 4.10
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2013 F350 CC 4x4 DRW 6.7 Lariat Ultimate package.
2013 Heartland Bighorn 3610RE Fiver

*Previously owned *
2004 F350 CC Lariat 6.0 4X4 156 WB
2001 F250 CC XLT 7.3 4X4 156 WB
2006 Heartland Bighorn 3200RL Fiver
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post #7 of 16 (permalink) Old 07-22-2019, 08:33 AM
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I was going by Ford Website and I just configured another f350 4x4 crew cab XL STX package, 6.7 diesel :


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$39,605 Base MSRPS1
$18,585 Total of OptionsS4
$1,595 Destination ChargesS17
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$821 Monthly PaymentS6 Purchase based on $5,979 down payment, 84 month term and 7.9% APR, $0 trade-in-value
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$39,605 2019 Ford Super Duty F-350 XL, Crew Cab®, 8’ Box, 6.7L 4-Valve Power Stroke® Diesel V8 (B20) Engine, TorqShift® 6-Speed SelectShift® Automatic with 6.7L engine, 3.55 Limited Slip Axle Ratio, 4X4, DRW

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2015 F350 Platinum Max Tow What a beast with the 4.30 gears!
2006 F450 CC Hauler bed 4x2 6.0 L 6.0 auto, Lariat, 4.30 r/a, SCT, 4in exh. 103K New heads to repair diesel in coolant, 148K.
2006 F350 Lariat CC Dually 4X2, 6.0 auto 4.10 LS, SCT, airbags, 4 in. exh. 154K Rebuilt engine to repair damage from burned piston. One head to fix fuel in oil problem.
36 feet on the floor Elite/Outlaw LQ horse trailer.
35+5 foot double tandem axle flatbed trailer.
36 foot double tandem axle flatbed trailer
36 foot Platinum 6 horse LQ, side load, full width back tack
2003 EB Expedition 171K (no engine repairs, gas burners are the new longevity leaders)
2004 Volvo V70R AWD-high miler in fleet, 253K (no engine repairs) Hail totaled it but I kept it. Looks like a golf ball now.
Suzuki Carry KEI truck, 660cc 3 cyl DOHC EFI 4X4 5 speed RHD. Sort of a Smart Car sized pickup. Eats Gators and Mules for lunch.
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post #8 of 16 (permalink) Old 07-22-2019, 10:50 AM
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SO which Ford provided information source is wrong?

Your Super Duty

Save
Share
Print

Payment
$39,605 Base MSRPS1
$18,585 Total of OptionsS4
$1,595 Destination ChargesS17
$59,785 Total MSRPS16
-$1,000 Available IncentivesS3

$58,785 Estimated Net PriceS5
$821 Monthly PaymentS6 Purchase based on $5,979 down payment, 84 month term and 7.9% APR, $0 trade-in-value
Get an Internet Price
Search Inventory
Special Offers
Look up Trade-In-Value
Pricing Tools

Print Page
Calculate PaymentsS6
Available Incentives
Estimate Your Credit
Apply for Credit

Edit
Model
$39,605 2019 Ford Super Duty F-350 XL, Crew Cab®, 8’ Box, 6.7L 4-Valve Power Stroke® Diesel V8 (B20) Engine, TorqShift® 6-Speed SelectShift® Automatic with 6.7L engine, 3.55 Limited Slip Axle Ratio, 4X4, DRW

Edit
PaintS4
$0 Race Red
$0 No Secondary Color

2015 F350 Platinum Max Tow What a beast with the 4.30 gears!
2006 F450 CC Hauler bed 4x2 6.0 L 6.0 auto, Lariat, 4.30 r/a, SCT, 4in exh. 103K New heads to repair diesel in coolant, 148K.
2006 F350 Lariat CC Dually 4X2, 6.0 auto 4.10 LS, SCT, airbags, 4 in. exh. 154K Rebuilt engine to repair damage from burned piston. One head to fix fuel in oil problem.
36 feet on the floor Elite/Outlaw LQ horse trailer.
35+5 foot double tandem axle flatbed trailer.
36 foot double tandem axle flatbed trailer
36 foot Platinum 6 horse LQ, side load, full width back tack
2003 EB Expedition 171K (no engine repairs, gas burners are the new longevity leaders)
2004 Volvo V70R AWD-high miler in fleet, 253K (no engine repairs) Hail totaled it but I kept it. Looks like a golf ball now.
Suzuki Carry KEI truck, 660cc 3 cyl DOHC EFI 4X4 5 speed RHD. Sort of a Smart Car sized pickup. Eats Gators and Mules for lunch.
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post #9 of 16 (permalink) Old 07-22-2019, 01:00 PM
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4.10 can make it up the hills faster when towing 17k-18k. 3.55 gets better mpg when not towing. Which is more important to you?

2001 F350 XLT 4X4 crew cab, dual rear wheels, long bed, black, 7.3l turbo diesel, automatic transmission, 4.10, shift on the fly, running boards, sliding rear window, 38 gal fuel tank, Odyssey extreme 65-PC1750T batteries, Michelin LTX-MS2 rear tires, Sumitomo Encounter front tires, Shell Rotella Ultra elc, 11,500 gvwr, 20,000 gcwr, 7500 gvw, completely stock, 114,000 miles when purchased, now has 250,000 miles, repairs so far: two starters, batteries, cps, brakes, tires, alternator, ball joints, locking hub, wheel hub, AC compressor, serpentine belt, power steering pump, driver's side window, ignition switch, o-ring, Spectra premium radiator, water pump, fan clutch, fan blades, thermostat, thermostat housing, tensioner. Stolen twice so far, but recovered both times with major damage.

2005 Nomad Rampage toyhauler made by Skyline. 11,500lb gvwr.
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post #10 of 16 (permalink) Old 07-29-2019, 03:21 PM
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I wanted the 4.30 so got an F450. A 4.10 may get better mileage, but not by much. A higher ratio like the 4.10 or 4.30 will let you get a load going with less strain on the engine and transmission and may even get better fuel mileage except for long, long highway miles on level ground. If you're doing any stop and go, and I don't mean constant stop and go like city driving but every few miles going through small towns, or going anywhere but level ground you'll appreciate the lower ratio and won't suffer meaningful differences in mpg.
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post #11 of 16 (permalink) Old 07-30-2019, 07:50 AM
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No matter what rear gear you get from the factory the transmission will make up for it in the higher gear. Any gear your truck comes with will work just fine. I have 3.31"s in mine and I have no problem towing my 13,000 5th wheel. I didn't think it was going to work and was surprised at how the truck handled the trailer.
Fuel millage will basically be the same no matter which gear you chose.
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post #12 of 16 (permalink) Old 08-08-2019, 12:15 PM
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I messed up when I ordered my 2019.
I thought the same on the gears and mileage so I did the 3.55.
Towing up 6% grades with a 17,000lb 5er, I wish I had the 4.10.
Shifts down into 4th to maintain 60mph.
My 2012 with the 3.73 would hold 60mph in 5th up the same hills.
I see no difference in unloaded mileage between my 2012 with 3.73 and my 2019 with 3.55.

Go the 4.10.

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post #13 of 16 (permalink) Old Yesterday, 08:24 AM
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The best analogy I can think of concerning a gear ratio intended for fuel mileage is trying to pedal a 10 speed bike up a steep hill in high gear. Get your truck equipped for towing & let the fuel mileage take care if itself. The mileage probably won’t be affected that much anyway. My ‘13 dually does fine with the 3.73 gears towing my 16,400 pound 5th wheel, but I wouldn’t want to do it with the 3.55. My next truck (if I live that long☺️) will probably have the 4.10s. Heck. It may even be an F-450!
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post #14 of 16 (permalink) Old Today, 12:27 PM
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The best analogy I can think of concerning a gear ratio intended for fuel mileage is trying to pedal a 10 speed bike up a steep hill in high gear. Get your truck equipped for towing & let the fuel mileage take care if itself. The mileage probably won’t be affected that much anyway. My ‘13 dually does fine with the 3.73 gears towing my 16,400 pound 5th wheel, but I wouldn’t want to do it with the 3.55. My next truck (if I live that long☺️) will probably have the 4.10s. Heck. It may even be an F-450!
High gears are not intended for going up steep hills. Low gears are for that. High gears are for level ground. High gears will not help you to make it easier to get up a steep hill. Try riding the ten speed on level ground with the lowest gear. Then you will agree that the higher gear is better for level ground. The reason why Ford offers different gears is that some people drive on level ground with light loads. Others drive up steep hills with heavy loads. A higher gear is better for some people, while a lower gear is better for others. It depends upon how you will use your truck.

2001 F350 XLT 4X4 crew cab, dual rear wheels, long bed, black, 7.3l turbo diesel, automatic transmission, 4.10, shift on the fly, running boards, sliding rear window, 38 gal fuel tank, Odyssey extreme 65-PC1750T batteries, Michelin LTX-MS2 rear tires, Sumitomo Encounter front tires, Shell Rotella Ultra elc, 11,500 gvwr, 20,000 gcwr, 7500 gvw, completely stock, 114,000 miles when purchased, now has 250,000 miles, repairs so far: two starters, batteries, cps, brakes, tires, alternator, ball joints, locking hub, wheel hub, AC compressor, serpentine belt, power steering pump, driver's side window, ignition switch, o-ring, Spectra premium radiator, water pump, fan clutch, fan blades, thermostat, thermostat housing, tensioner. Stolen twice so far, but recovered both times with major damage.

2005 Nomad Rampage toyhauler made by Skyline. 11,500lb gvwr.
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post #15 of 16 (permalink) Old Today, 01:30 PM
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High gears are not intended for going up steep hills. Low gears are for that. High gears are for level ground. High gears will not help you to make it easier to get up a steep hill. Try riding the ten speed on level ground with the lowest gear. Then you will agree that the higher gear is better for level ground. The reason why Ford offers different gears is that some people drive on level ground with light loads. Others drive up steep hills with heavy loads. A higher gear is better for some people, while a lower gear is better for others. It depends upon how you will use your truck.
I am pretty you two are on the same page, but what a high gear (numerically) to you is what he means by low gear. Ideally he would have specified higher meaning 3.55's. It's hard to know what someone means when they say "higher" gear.

2017 F-350 CCSB 6.7L
[old]2002 7.3L PSD, 6spd, 4x4 Off-Road, Super Cab, Short Bed, ARE Topper, SCMT Autometer gauges, Tymar, 4" SS aero-turbine exhaust, & WW.

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