3.73 -vs- 4.10 rear end MPG difference on a 6.0? - Diesel Forum - TheDieselStop.com
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6.0L Power Stroke Engine and Drivetrain Discussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super Duties and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.0L Power Stroke engine.

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Old 08-21-2005, 08:16 PM   #1 (permalink)
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3.73 -vs- 4.10 rear end MPG difference on a 6.0?

What will be the difference in MPG in a 3.73 rear end -vs- a 4.10 in a dually loaded and unloaded?

Also, if I'll be towing a 15K trailer will the 4.10 rear end help out that much as compared to a 3.73?
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Old 08-21-2005, 09:40 PM   #2 (permalink)
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Re: 3.73 -vs- 4.10 rear end MPG difference on a 6.0?

The 6.0 likes the 4.10 better for towing. I went from a '03 3.73 6.0 to an '05 4.10 6.0 and there is a world of differance when towing. I am running a 6 speed in both trucks.
As far as mileage it all depends on the right foot. I have seen as much as 17 mpg (hand Calculated) running empty but overall average of about 15 mpg (city and highway combined)is most common and towing 12,500 plus I see about 12 to 13 mpg just depends on the wind and if I get caught behind a gasser (motorhomes, V-10's, Hemis, etc [img]/ubbthreads/images/graemlins/blush.gif[/img] ) that thinks he has got the power to pull the long grades here in Alaska. [img]/ubbthreads/images/graemlins/grin.gif[/img]
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Old 08-21-2005, 09:41 PM   #3 (permalink)
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Re: 3.73 -vs- 4.10 rear end MPG difference on a 6.0?

I have a crew cab dually with the 4.10 rear. I see 12-14 city, 17-18 hwy
and 15-16 combined. Now, with my 5th wheel (15000lbs) hwy varies by speed and land level. So, I see 11-12mpg flat land @65-70mph. At 75mph, it drops to 9-10mpg. In the hills I see 9-10mpg @65-70mph. I hope this helps. Anthony
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Old 08-22-2005, 12:39 AM   #4 (permalink)
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Re: 3.73 -vs- 4.10 rear end MPG difference on a 6.0?

There is a member on another forum I belong to who is deeply involved with the testing of ford, dodge, and chevy trucks. In his opinion (which from reading everything he posts, I highly value), when you have two ford Superduties, one with 3.73 and the other 4.10, and all else being equal, the 4.10 will get better mileage. It has to do with the load on the engine and how there is more load with 3.73 gears than with 4.10. The fact that there's more load on the engine with 3.73's is worse on fuel mileage than the fact that there's higher RPMs with 4.10's. Overall, the 4.10s would have better fuel mileage than the 3.73s, all else being equal.
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Old 08-22-2005, 08:20 AM   #5 (permalink)
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Re: 3.73 -vs- 4.10 rear end MPG difference on a 6.0?

Not sure when Ford started with the bigger tires\wheels, but don't forget that this will 'change' the gear ratio as well. My '05 is closer to 3.55's with the 18" wheels than my '00 with the 16" and the 3.73's. I am thinking about getting a price for switching to the 4.10's because of what Ryan is referring to.
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Old 08-22-2005, 08:34 AM   #6 (permalink)
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Re: 3.73 -vs- 4.10 rear end MPG difference on a 6.0?

its not the size of the wheels - its the size of the tires that matter.
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Old 08-22-2005, 08:36 AM   #7 (permalink)
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Re: 3.73 -vs- 4.10 rear end MPG difference on a 6.0?

I am aware of that and factored that in. Still came closer to being 3.55 than 3.73.
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Old 08-22-2005, 09:44 AM   #8 (permalink)
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Re: 3.73 -vs- 4.10 rear end MPG difference on a 6.0?

Yea the 34" OEM's mounted on 20" don't help the 3:73 much. If I have to change gearing to get another few mpg then I'll probably install lockers too. The Sterling diff's are new to me but I'm learning!

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Old 08-22-2005, 10:28 AM   #9 (permalink)
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Re: 3.73 -vs- 4.10 rear end MPG difference on a 6.0?

[ QUOTE ]
its not the size of the wheels - its the size of the tires that matter.

[/ QUOTE ]

But my wife keeps telling me size doesn't matter.
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Old 08-22-2005, 01:20 PM   #10 (permalink)
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Re: 3.73 -vs- 4.10 rear end MPG difference on a 6.0?

after putting my 315's on my truck, i switched out to 4:10's, which basically brought the truck back to stock again. i did notice a small increase in mileage, and a slight inclrease in freeway RPM's, which was fine with me.


also, my factory gear's were almost toasted, they had obviously been setup wrong from Ford.
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