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5R55E Delayed upshift under heavy throttle

Davenothere

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Feb 3, 2016
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Location
Glencoe
Vehicle Year
2003
Make / Model
Ford
Engine Size
4.0
Transmission
Automatic
My credo
The more you do, the more you are
Hello Folks, I am a newbie to TRS and this is my first post. Although I have been reading posts as a guest for years.
I bought a ranger for my first vehicle ten years ago and it is still my daily drive today. I recently picked up another ranger from a female aquantance whos mechanic duped her into thinking it was f&cked. She then sold it to me for $500 bucks. There was nothing wrong with it except the fact that she bought new tires but only on the rear and left the old tires on the front. Being a 4X4 truck this chewed up the transfer case a little and it doesn't shift in and out of 4X4 without backing up a little. not a big deal AFAIC. However it does have 380, 000 KM on it. I cleaned the MAF and replaced the O2 Sensors, put in a new set of plugs and the engine runs like a dream. The 5R55E is tired, although it still works flawlessy under light to moderate throttle, engages all gears with no delay and no slipping. Under Heavy throttle however it delays 1-2 upshift and under WOT will not upshift. I am considering replacing the valve body gaskets and solenoids, a process I have not done before. some specific questions I have are...what should I cross of the list first?..is there something silly like TPS or vacuum leak that could cause this issue? Thankyou for any input as it is greatly appreciated.
 


gw33gp

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Joined
Aug 7, 2007
Messages
1,553
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Location
Costa Mesa, CA
Vehicle Year
2002
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0 SOHC
Transmission
Manual
2WD / 4WD
4WD
Tire Size
33"
Someone here may know the answer to your questions but I suggest you post this question at http://www.network54.com/Forum/260730. That is the Ford Transmission Forum and people there are better at answering these types of in depth transmission questions.
 

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