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Ford Truck Club Forum > FORD F-250 | F-350 SERIES | SUPER DUTY > 2011-2016 Ford F250 | F350



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  #1  
Old August 13th, 2019, 09:57 AM
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Default Towing with 6.2l

Just bought my first Ford and so far love. It's a '15 F250 with 6.2 My only issue is towing. Pulled 4500lb trailer on highway, and truck will not shift into 6th gear. Cannot hold speed even on flat road. Below 60mph it's fine. Highway speeds it falls flat on its face. I have to add that the truck has a 4" lift and 35X12.5 tires. Does anyone else have same issue? I expected a little more out of this engine.
Thanks in advance.
  #2  
Old August 13th, 2019, 12:28 PM
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Are you using tow/haul mode?

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
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Old August 13th, 2019, 05:17 PM
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Yeah, tried that. Made it worse. Would stay in 4th gear with the occasional upshift to 5th, but only on flat or downhill.
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Old August 13th, 2019, 09:16 PM
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What axle ratio do you have? Have you checked your cats for excessive backpressure?

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
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Old August 13th, 2019, 09:31 PM
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3:73 gears. Havent checked cats. Only had the truck for 1 week. I will check that. Thank you. Never owned a 6.2l so dont know what to expect.
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Old August 14th, 2019, 07:56 AM
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buddy experienced something of the same
a fuel filter change made it run like new


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  #7  
Old August 14th, 2019, 09:55 AM
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These newer trucks don't have an easily replaceable fuel filter. It's a "lifetime" filter inside the tank.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
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Old August 14th, 2019, 12:04 PM
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now that I think his was an '06, 6.0


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  #9  
Old August 14th, 2019, 01:39 PM
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Diesels have a big serviceable fuel filter and water separator.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS


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DeweyFum , FirstFord , glc , harrison28 , JSoko , Stratos201 , The Bone

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