3.73 or 3.55 Rear End Ratio - Ford Powerstroke Diesel Forum
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Old 10-16-2010, 04:28 PM
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3.73 or 3.55 Rear End Ratio

I am thinking of ordering a 2011. Right now I have an 07 with the 3.73 Limited Slip RR

I will be both either towing a 5th wheel at times or carrying a camper. Can I get a 3.73 or had Ford changed it to the 3.55

Does anyone here have the 3.55 and doing any heavy towing?
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Old 10-16-2010, 05:00 PM
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I have 3.31s and tow about 40% of the miles usually around 4000 to 7000 pounds. I think the 6 speed makes a huge difference for us guys with the higher diff gears.
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Old 10-17-2010, 03:37 PM
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My 3:31's in the Ford will out pull my 3:73's in the Dodge with a chipped 5.9. Go with the 3:31's, I tow about 25% of the time and when I do tow I'm 25K plus and it handles it very well.

Last edited by jimchris; 10-18-2010 at 03:42 AM.
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Old 10-17-2010, 04:00 PM
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Quote:
Originally Posted by jimchris View Post
My 3:11's in the Ford will out pull my 3:73's in the Dodge with a chipped 5.9. Go with the 3:11's, I tow about 25% of the time and when I do tow I'm 25K plus and it handles it very well.
Do you mean 3.31s or am i missing something?
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Old 10-18-2010, 03:43 AM
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Quote:
Originally Posted by jstange2 View Post
Do you mean 3.31s or am i missing something?
Yea, 3:31's
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Old 10-18-2010, 04:22 AM
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I pulled my 8000 lb (i know)camper and got 12 mpg. Absolutely no lack of power either.
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Old 10-18-2010, 06:43 PM
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I also have 3.31s on my longbox crew cab, and while towing a 4000 lb dry / 7500 lb gross trailer it is quite happy in 6th gear. I have to say that surprised me given that my 7.3 does strain somewhat while towing that trailer.
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