tc lock up - Ford Powerstroke Diesel Forum
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  #1  
Old 01-02-2008, 02:13 PM
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tc lock up

when is the best time to manually lock the converter under normal driving and whens the best time while towing, thanks
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  #2  
Old 01-02-2008, 02:49 PM
John Wood Nut Swinger

 

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I lock mine when I am in the foothills above 1600rpm when running solo and no one is behind me. If there is someone behind me I keep it around 1900rpm, it is a smoke thing. My injectors flow too much fuel down low and it will smoke three lanes out behind me if I don't watch how low I lug it.

When towing I don't like to force a lock until 2400rpm or so. You need to have enough RPM to spool the turbo so if you lock it too soon the engine lugs and smokes like crazy.
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Old 01-02-2008, 05:22 PM
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does it make your o/d light flash? How much cooler will this keep the trans?
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Old 01-02-2008, 05:24 PM
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How about driving with a mostly stock truck, normal everyday unloaded driving???
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Old 01-02-2008, 06:24 PM
John Wood Nut Swinger

 

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Yes it will make your OD light flash. With a stock trans I would see over 40* drop in trans temps while towing at lower speeds where the TC would not lock-up.
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Old 01-03-2008, 04:53 PM
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nice. will the flashing light hurt anything or is it more of an eyesore? what is that flashing light supposed to mean
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Old 01-03-2008, 05:06 PM
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what exactly is a tc lock up
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  #8  
Old 01-03-2008, 10:14 PM
John Wood Nut Swinger

 

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The flashing light is saying the PCM does not think it should be locked. It will not hurt anything.

The TC lock, locks the TC.
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