Will 4.10 gears cost me 2 mpg vs. 3.73? - Ford Powerstroke Diesel Forum

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post #1 of 11 Old 12-29-2009, 11:27 AM Thread Starter
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Will 4.10 gears cost me 2 mpg vs. 3.73?

Assuming 4.10 gears will eat 2mpg's vs. 3.73 gears. For example a truck with 3.73 gets 15 mpg would a truck with 4.10 gearing get 13 mpg?

Thanks for the info...
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post #2 of 11 Old 12-29-2009, 12:24 PM
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You probably won't lose 2 mpg, but IMO its not worth the $$ to swap from 3.73's to 4.10's. Are you running bigger tires?

--Snake
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post #3 of 11 Old 12-29-2009, 12:35 PM Thread Starter
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Have the option to purchase a couple different DRW trucks, my first choice is one with the 4.10 gears everything else is stock and I will keep it stock. I do lots of highway driving I am concerned how the higher rpm's with the 4.10 gears are going to eat fuel vs. lower rpm's with 3.73 gears.

Thanks for the response.
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post #4 of 11 Old 12-29-2009, 12:38 PM
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Sorry about that! I was under the impression you had a truck with 3.73's and were going to go to 4.10's.

Do you tow frequently? If yes, what are you towing (how heavy)?

4.10's aren't really a bad option for a DRW truck. The extra weight of the truck can make the 4.10's worth the $$, especially if you're pulling a trailer.

--Snake
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post #5 of 11 Old 12-29-2009, 01:03 PM
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Depending on the load youre going to be pulling, 4:10s will be better for starting off. I have 3:73s in mine, and dont really notice a lag in starting off when pulling a trailer. 4:10s will have a higher GVWR rating than the 3:73s. I like mine with 3:73s for what its worth. and you could always go with 35" tires and lose some of the gearing with the 4:10s if you didnt like it. I love the look of a dually on 35's!

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post #6 of 11 Old 12-30-2009, 07:50 AM Thread Starter
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Tow a horse trailer approx 7500 lbs and a big boat approx 8000 lbs. Do a couple of 1500 mile round trips with the boat in summer and would get a lot of sway from the big rigs when they pass me with my SRW truck. Thought the dually would help out plus I like the look.

Probably only towing 25% of my miles that is the concern with the poor mpg highway mile with the 4.10 gears. Maybe I am over thinking this and should just buy the truck. Thanks for your input and suggestions.
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post #7 of 11 Old 12-30-2009, 08:03 AM
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I've always averaged 16mpg with my 4.10's when empty and 12mpg with a load and don't think I would like running anything less. For those long trips you will definitely appreciate them especially on the grades.

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post #8 of 11 Old 12-30-2009, 08:04 AM
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Glad we could help, and based on your last post about the horse trailer and boat, I'd personally buy the truck with the 4.10's.

The 4.10's won't kill your economy when you're not towing.....

--Snake
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post #9 of 11 Old 12-31-2009, 08:29 AM Thread Starter
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Just bought the truck. Thanks for the advice.
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post #10 of 11 Old 12-31-2009, 08:39 AM
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Congrats!!! Lets see some pics of the new rig! And don't be a stranger, either.....
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