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F150 slipping at HWY speeds

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Old Feb 17, 2010 | 09:22 PM
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F150 slipping at HWY speeds

Help!!!! Recently i was driving my 01 F150 4X4 and at HWY speeds i will be cruising along with cruise on and off and i noticed the RPMS jumping up 1-2 hundreds. You can feel like it is just slipping when this happens. The frequency is increasing. I took it into the dealer and they ran diagnostics with nothing. He did not notice it on test drive but on the way home it did it constantly. The fluid level was in the cold area after driving it for 100 miles so i filled it so it registered in where it should when hot. The mechanic stated that the level was correct and that it was clean.

Can anyone give me an idea where to start to look?

This is my first post so thanks for any help.

Desperate and poor in ND.
 
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Old Feb 18, 2010 | 12:59 PM
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did it feel like it was fluttering between gears?
 
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Old Feb 18, 2010 | 01:35 PM
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You feel very little except for a slight loss of grip i guess. The increase of RPM's are more noticeable and at the same time you feel like you lost grip on the road even though you didn't. it only happens on cruising speed. there is no effect on acceleration or deceleration. It is not changing gears.
 
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Old Feb 18, 2010 | 05:33 PM
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How many miles since the last fluid change? If more than 30k, change the fluid.
 
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Old Feb 18, 2010 | 07:28 PM
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Sounds like the torque converter is unlocking and locking up. Is it on any kind of hills? When you lay into the throttle does it slip at all?
 
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Old Feb 18, 2010 | 10:21 PM
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No hills and no throttle changes.
 
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