Transmission slipping ??

 
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Old 06-15-2019, 02:33 PM
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Transmission slipping ??

Hello Iím new to the forum,

I have a 2004 f150 5.4 4x4. The truck feels normal shifting through gears but when the accelerator is pressed hard to downshift the engine revs up and goes nowhere. Struggles going up a hill also. Changed trans fluid, dropped valve body and checked and everything seems ok. Are the clutches done? No lights on dash.

please any help appreciated
 
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Old 06-15-2019, 03:01 PM
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How many miles?

Have the plugs been changed? Any engine lights?
 
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Old 06-15-2019, 03:07 PM
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225000 kms. No check engine light. I have not changed the plugs yet. Bought the truck last week with this problem and I am trying to figure out what exactly the problem is.
 
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Old 06-15-2019, 03:54 PM
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You may have plugged catalytic converters. Take it to an exhaust shop and have them tested for backpressure.
 
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Old 06-15-2019, 04:14 PM
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Originally Posted by glc View Post
You may have plugged catalytic converters. Take it to an exhaust shop and have them tested for backpressure.
Thanks for the reply, I never thought of that. I will have them checked.
 
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Old 06-15-2019, 07:55 PM
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Restricted exhaust won't cause the transmission to slip, if that is what is actually happening. "engine revs up and goes nowhere" is a poor description of whatever might be happening.

If the engine will rev just fine, you are probably looking at a transmission replace/rebuild.
 
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Old 06-15-2019, 09:41 PM
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It was the plugged up catalytic converters !!

I loosened the nuts at the flanges coming off the headers before the cats on both sides to allow the exhaust out and what a difference! She climbs the big hill at the top of my road like a champ gaining speed the whole way. I was actually surprised at how fast the truck was. Thanks glc

 

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