2011 Ford F350 6.7

[havehammer]

I have a 2011 F350 4x4 dually with a 6.7 engine. I average about 3000 miles a week. What would an add on overdrive do for me?

 

[icanfixall]

Welcome to the forum. To easily answer this my suggestion is buy the Gear Vendors and install it behind you auto trans. Go to their site to see what mileage improvement it will give you. For me its really improved my mpg. This system makes my final drive ratio 1.96 to 1. My rear gears are 3:55. This is the rpm and mph on the cali freeways. I drove home from the 2009 rally in Bowling Green Ky doing up to 85 mph and still got 18.9 mpg average.

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[79jasper]

In the wrong forum buddy.
With the trans you have, I doubt you would benefit from an overdrive.
Maybe a gear or tire change.
What are you looking for?
Is it tuned?

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[IDIoit]

This is the rpm and mph on the cali freeways.

this obviously isnt on the 405 lol