Power loss
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Power loss
I have a 2009 f250 with 70,000 miles on it and for the last 6 months I have been experiencing some power loss. It happens every time there is the slightest incline on the road, it has to down shift to 3rd gear just to maintain that speed. If I don't push on the pedal until it down shifts to 3rd I slow down to 40mph no matter what the speed was before I hit the incline/hill. I also went from 14 mpg to 10.5mpg. I have heard so many theories and am curious if the fact I upgraded to 35 inch tires and never updated the trucks computer. Any help would be greatly appreciated.
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Joined: Sep 2000
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From: Stephensville WI
Going from the stock 32s to 35s is like changing your gear ratio from the stock 3.73 to 3.41. You'd need to change to around a 4.10 ratio to correct this and retain the effective stock ratio.
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From: Meaford , Ontario
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From: Land of Taxes
Dont rule out basic tune up items either...those lovely plugs been replaced yet??? Air filter fuel filter etc....But I do agree you've messed with the final drive gear ratio which screws with the shift points and fuel economy. I wonder if a re-program might help out a little as well???
Change that torqueshift filter and fluid often!
Change that torqueshift filter and fluid often!
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