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  #1  
Old 01-27-2011, 10:57 AM
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3.31 Gear Ratio

My 2010 F-150 was equipped with a 3.31 gear ratio. I have a few questions that hopefully can be answered.

1. The trans will drop into gear pretty hard when you idle from 50 down to about 30. Is this normal?
2. What are the Pros of this ratio
3. What are the Cons of this ratio.
4. Can anything be done to fix this?

Any info would be great.

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  #2  
Old 01-27-2011, 11:16 AM
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Quote:
Originally Posted by chavez1975 View Post
My 2010 F-150 was equipped with a 3.31 gear ratio. I have a few questions that hopefully can be answered.

1. The trans will drop into gear pretty hard when you idle from 50 down to about 30. Is this normal?
2. What are the Pros of this ratio
3. What are the Cons of this ratio.
4. Can anything be done to fix this?

Any info would be great.

1. Could need a program update, see your dealer.
2. Better gas mileage at on the highway.
3. Worse gas mileage in the city and not good for towing except light loads.
4. Fix what, the trannie problem or the cons. For the trannie, see my response. for the ratio cons, in all cases there are going to be pros and cons of each axle ratio. Lower ratio, lower mileage better towing.
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  #3  
Old 01-27-2011, 11:37 AM
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Sorry Kingfish,

I meant fix the trannie problem. Would Ford do this for free since it is a newer truck and it only has 8K miles on it?

Thanks
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  #4  
Old 01-27-2011, 01:29 PM
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You have a 36k warranty. Even if you are not the original owner it would fix it. Just explain the issue and if they can reproduce it, they will fix it. My guess it needs an updated software for the trannie.
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  #5  
Old 03-27-2011, 02:54 PM
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I hate my 3.31's... Its such a low gear to put in a truck. Im putting 4.10's in mine as soon as I level and put 35's on it.
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  #6  
Old 03-27-2011, 05:04 PM
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i just can't understand why ford would put 3:31's in a truck,,brazzeal i am going with 4:10's also,,keep me posted when you get yours done....
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  #7  
Old 03-29-2011, 01:13 PM
glc glc is offline
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They put 3.31's in because a very large percentage of owners leave their trucks stock and/or never tow heavy, and the performance is adequate while providing decent gas mileage. The low gear in the 6 speed tranny helps a lot with getting off the line.
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  #8  
Old 03-29-2011, 02:23 PM
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I thought the lower gear in a 6 speed would hold it back even more and only really help out on thee highway... Even though Im still cruising at 1800 RPM going 70 on the highway. i hope that when I put 4.10's in that it helps around town. I can live with losing an MPG or two on the highway as long as my transmission lives to see 50K and my city mileage improves.
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  #9  
Old 03-30-2011, 08:14 AM
glc glc is offline
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I'm talking about the low 1st gear - not the overdrive. "Low" gears = higher numbers.
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  #10  
Old 03-30-2011, 08:39 AM
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Quote:
Originally Posted by brazzeal15 View Post
I thought the lower gear in a 6 speed would hold it back even more and only really help out on thee highway... Even though Im still cruising at 1800 RPM going 70 on the highway.
Your 6th gear is the same as the fourth gear in the older transmissions. They are both a .7 in the last gear.

Also, as stated before me, a lower gear is a higher numerical number, meaning 3.31 is a higher gearing than 4.10s
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  #11  
Old 03-30-2011, 03:00 PM
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Quote:
Originally Posted by brazzeal15 View Post
I hate my 3.31's... Its such a low gear to put in a truck. Im putting 4.10's in mine as soon as I level and put 35's on it.
If your going to run 35" tires.Put 4.56 gears in it!!

I run 4.10 in my truck with the stock size tire on 16" rims and only see about 2300 to 2400RPMs at 70.

Phil
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  #12  
Old 03-30-2011, 06:29 PM
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2300 is too much for me. Ill stick with the 4.10 and keep my ***** and gas mileage on the highway. And GLC, sorry about that, I was confusing myself. I guess this new 6 speed is just an extra gear to help with acceleration. So the first gear is actually lower? Hmmm. Do you have a list of the tranny gears on these things? I would like to do the math on my drive ratio on all 6 speeds if I get the 4.10's to pull my 35's
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  #13  
Old 03-31-2011, 08:53 PM
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1 2 3 4 5 6 r
4.17 2.34 1.52 1.14 0.86 0.69 3.40
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  #14  
Old 07-20-2011, 06:41 AM
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I love the 3.31 gears in mine. In fact I ordered it that way.
On the highway if I am going 70mph and I want to pass it doesn't take much at all.
Yes I don't tow anything heavy just 3 atv's on an aluminum trailer, but unless you are towing a fifth wheel then 3.31 are wicked for fuel millage and higher speed acceleration.
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  #15  
Old 07-20-2011, 10:32 PM
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i like my 3:31s to there not that bad ive gotton 21 mpg highway and it still has plenty of power and doesnt down shift out of overdrive on hills. and when i tow my 4,000 pound camper it tows it fine with overdrive off.
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Old 07-20-2011, 10:32 PM


 
 
 
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