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My overdrive light started flashing in my '99 Expedition 5.4L. I came home and found this code with my scanner. It is a 1-2 shift error, and it drives great with no problems..........for most of the day. Ocassionaly, I can feel a slight "slipping" but not really a "slip" It kinda feels like the trans is lost between gears. And, it might happen, or I might be able to drive all day and it not happen at all.

I have always been scared about auto transmissions. I purchased this truck with a little over 70K on it and it now has 93k. I dont believe the fluid has ever been changed. It is still bright red and doesnt smell burnt. I am really unsure what to do next. Hopefully not a rebuild?

once again, any info appreciated!
-Robert:confused:
 

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sounds like a possible sticky solenoid. You might try to obtain a pinpoint test for that code and see where it leads you. :)
 

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Does it have the 4R70W or the 4R100? I know my fathers 00 5.4 Expy has the 4R100, but I don't know what other years got it.
 
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