Power loss
Thread Starter
|
New User
Joined: Jul 2015
Posts: 6
Likes: 0
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.
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
Likes: 1,678
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.
Junior User
Joined: Jun 2015
Posts: 79
Likes: 0
From: Meaford , Ontario
Trending Topics
Thread Starter
|
New User
Joined: Jul 2015
Posts: 6
Likes: 0
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Fleet Mechanic
Joined: Nov 2011
Posts: 1,825
Likes: 43
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!
Thread
Thread Starter
Forum
Replies
Last Post
custom1
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
4
Sep 5, 2006 01:31 PM