F150 axle ratio -- 3.31 vs 3.55 - Ford Truck Enthusiasts Forums



F150 axle ratio -- 3.31 vs 3.55

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Old 03-26-2002, 01:40 AM
knight82 knight82 is offline
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F150 axle ratio -- 3.31 vs 3.55

I am thinking about trading my Ranger Edge for a new 2002 F150 supercab 4x4. What difference will I see between the std 3.31 axle ratio and the optional 3.55? Is there a gas mileage hit for the 3.55 or is it insignificant? Is the 3.55 the way to go for the 5.4v8 4x4? Any performance issues? I will not be towing anything massive, but may be hauling some decent loads at times. Main use will still be city/highway transportation. Thanks for your suggestions. Any other options that are "musts"?
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Old 03-26-2002, 09:29 AM
knight82 knight82 is offline
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F150 axle ratio -- 3.31 vs 3.55

Also, is the mileage rating for the 4x4 lower due to running it in 4x4 mode, or is it lower all the time due to something transmission-wise? In other words, would you get the same mileage from a 4x4 in 2x4 mode as you would for a 2x4 truck?trying to decide on 4x4 vs 2x4 - is the cost worth it?
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Old 03-26-2002, 08:03 PM
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F150 axle ratio -- 3.31 vs 3.55

There isn't that big of a difference between 3.31 and 3.55s. I have 3.55s and does well towing on 235/75/15 tires. 3.55 is the way to go. You will see 1-3mpg less on a 4x4 becuase of the added weight. If it is worth it, depends on where you drive. Do you have hilly terrain with bad winters? Yes, it is worth it. I live in new england and tow a snowmobile trailer to maine on a 2wd truck with a limited slip rear axle. I have trouble on slick roads pulling the trailer, but am find w/o the trailer. To help, i got 4 studded snow tires, which helps, but am seriously thinking of converting my 2wd to 4wd.


Primary rig is:
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Old 03-27-2002, 07:23 AM
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F150 axle ratio -- 3.31 vs 3.55

If you have any ideas of upgrading to larger tires in the future (talking overall diameter) go with the numerically higher gear. This would be more important on a 4 WD as many owners go from the OEM 255/70-16 (approx 30.2" dia) to larger 285/75-16 (approx 33" dia). The differance in fuel mileage bettween the 3.31 and 3.55 can't be more then 1 mpg on the highway. I have a 99 Expy 5.4L with 3.73 limited slip and at 60 am turning the motor only about 250 rpm faster then a buddy's 00 5.4L with 3.55 gears. While the 3.31 would be ok for a flat land / low elevation daily driver running around with an empty bed and with no need for towing, I recommend a 3.55 as a minimum. Go for the 3.73 if you will be working her.

Petrol

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Old 03-29-2002, 12:19 AM
Wilber15 Wilber15 is offline
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F150 axle ratio -- 3.31 vs 3.55

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