3:73 Gears vs 3:55 MPGs? - Ford Powerstroke Diesel Forum
 
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post #1 of 8 Old 02-25-2010, 07:31 AM Thread Starter
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3:73 Gears vs 3:55 MPGs?

Have an 08' F350 4x4 CC stock 20's with 3:73 gears. Getting 11 in town. Wander what it would be with 3:55's? I am going to tune/DPF delete soon so should improve but wandering what a new 2010 might do for me instead as seems they come with 3:55's. I pull heavy loads monthly, just pulled 3 loads of 13k lbs each yesterday. Thanks for your input.
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post #2 of 8 Old 03-01-2010, 06:09 PM
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Check out this thread. It got a little heated between me and another member but some good info came out, as well as a little table I put together comparing gears and tire sizes. Rear end ratio for mileage.

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post #3 of 8 Old 03-02-2010, 05:41 PM
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I don't think it will make a great deal of difference, to offset the cost of changing the gears, you will have to save a LOT of fuel.

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post #4 of 8 Old 03-02-2010, 07:45 PM
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Quote:
Originally Posted by jtcf350 View Post
Have an 08' F350 4x4 CC stock 20's with 3:73 gears. Getting 11 in town. Wander what it would be with 3:55's? I am going to tune/DPF delete soon so should improve but wandering what a new 2010 might do for me instead as seems they come with 3:55's. I pull heavy loads monthly, just pulled 3 loads of 13k lbs each yesterday. Thanks for your input.
Gear Vendors under/overdrive, Frequently asked questions.

If you spend a few grand for one of these,would you like the flexibility of both gear ranges??? I plan to get one in a year or so..I spend a lot of time driving near empty on a flat "coastal plain" at 65mph ..I am reasonably certain that my engine is lightly loaded in those conditions.

Payback? ...I .dont really care...If i like it,the company supports you with adapting it to your next vehicle.
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post #5 of 8 Old 03-03-2010, 04:28 PM
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I don't think the difference between 3.55 & 3.73 would warrant he cost,especially towing!I've got 3.73's & when I Hooked to my 5th wheel I wish I had 4.30's! JMHO
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post #6 of 8 Old 03-18-2010, 11:49 PM
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Quote:
Originally Posted by mrnecsteve View Post
Gear Vendors under/overdrive, Frequently asked questions.

If you spend a few grand for one of these,would you like the flexibility of both gear ranges??? I plan to get one in a year or so..I spend a lot of time driving near empty on a flat "coastal plain" at 65mph ..I am reasonably certain that my engine is lightly loaded in those conditions.

Payback? ...I .dont really care...If i like it,the company supports you with adapting it to your next vehicle.
i also intend on geting one of these seems like a solid product.
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post #7 of 8 Old 03-18-2010, 11:59 PM
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I seriously doubt you will gain anything around town, it's likely that you will lose mileage. Higher gears (numerically lower) make motors work harder to accelerate.

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post #8 of 8 Old 03-19-2010, 02:30 AM
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If I were towing 13k on a regular basis....I would't go higher...I would go lower on the gears....

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