3.31 gear??? - Ford Powerstroke Diesel Forum
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Old 09-13-2010, 07:24 PM
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3.31 gear???

Anyone with the 3.31?

Im wondering what you think? How do they tow?

I don't tow very often so Im thinking of going with the 3.31 gears over the 3.55 plus going with the 3.31 save me like $1300.

I haven't looked it up so I will just ask but is there any tow weight difference from 3.31 to 3.55?

Thanks SB.
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Old 09-13-2010, 07:50 PM
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We have touched on this in another thread actually, Lots of different info in there but I dont think anyone with the 3.31 has posted.
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Old 09-13-2010, 08:03 PM
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Quote:
Originally Posted by Windturbineguy View Post
We have touched on this in another thread actually, Lots of different info in there but I dont think anyone with the 3.31 has posted.


I ordered and have the 3.31 and LOVE it. The fuel mileage is awsome. Getting 22-24 on the highway. But about 16-18 in the city.

Towing my Airstream with 900 miles on it was around 14. But I believe it will only get better. Sounds more quiet also.

Shane
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Old 09-13-2010, 08:05 PM
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Wow, thats pretty impressive. What kind of weight on the airstream?
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Old 09-13-2010, 08:07 PM
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Quote:
Originally Posted by srkr View Post
I ordered and have the 3.31 and LOVE it. The fuel mileage is awsome. Getting 22-24 on the highway. But about 16-18 in the city.

Towing my Airstream with 900 miles on it was around 14. But I believe it will only get better. Sounds more quiet also.

Shane
Good info thank you Sir.

What are your truck spec's? Crew cab short bed long bed 250 350?
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Old 09-14-2010, 03:27 AM
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I have the 3:31's, I don't tow often but when I do it's around 25K plus. It pulls better than my chipped 5.9 with 3:73's. I also put a 1 inch taller tire on.
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Old 09-14-2010, 03:21 PM
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F250 Crew Cab Short Bed 4x4 Lariat 6.7 Dual Alternaters,Cab Heater,Moon Roof,Heated/Cooled Seats/Fx4 Package

With a Retrax bed cover.

Weight on Airstream about 7,000 lbs

800lb tounge weight.
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Old 09-14-2010, 03:53 PM
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I don't think you will have any issues towing with the 3.31 ! This truck have so much low-end tourque to accomidate the 3.31 with no problem.
The different at 70mph.....3.31> 1500 rpm
3.55> 1700 rpm
As you can see the difference is very small ...so I wouldn't sweat it!! 3.31 or 3.55...you'll be happy with it.
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Old 09-14-2010, 03:55 PM
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Not to be a smart*** but thats a pretty light trailer. What kind od terrain? Flat or mountains? I am basing it all off of the way I ordered a dodge in 09, went with 3.42's and it killed my MPG when towing 15K+
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Old 09-14-2010, 04:14 PM
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Well thats why I bought an Airstream, Thats why they call it a AIR-STREAM..Lightweight and cuts through the Air. Plus it will be around in 30 years unlike those fiberglass SOB 5th wheels.

It was a mixture of hills and and straight aways.

In my 2007 6.0 diesel I was getting 11mpg, when I towed my Airstream 2 months ago Over 3,000 miles to the Florida Keys from Texas and back.

So I'm already happy.

Shane

Last edited by srkr; 09-14-2010 at 04:21 PM.
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