4R75E Shift Problems
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Mountain Pass
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4R75E Shift Problems
Good day! Trying to keep this as short as possible. 04 FX4 5.4 3V with a 4R75E transmission. A year or so ago it began shuffling between 1st and 2nd instead of a firm shift. It threw a P0750 code so I replaced the solenoid pack. No love. I then replaced the valve body because I found a slight crack when I replaced the solenoid pack. Still no love. It eventually fried first gear so we bought a reman transmission from O'Reilly Auto Parts and had a certified Ford mechanic install it. It did fine for a few months, but now, it's back to the same issue. I've checked the solenoid A wire for continuity... good. Checked it under load for voltage drop... good. Checked it for a short to ground... good. I'm at a loss! Can someone please help?
Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
If it were the same trans, I would say it was contamination. But having the same problem on the second trans is quite a coincidence. I have no answer.
If you clear the code, does it come right back?
If you clear the code, does it come right back?
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Mountain Pass
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Frmr Ford Trans Engr
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Mountain Pass
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I had an '08 Edge that did that with a coil pack. The coil went bad and when I replaced it, the new one immediately fried. Come to find out, when the old one went bad, it messed up that circuit in the PCM. If it's not the PCM, I have no idea what else it could be. There's no way it could be three solenoid in a row going bad with one of which being in a reman tranny.
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Vettedrmr
1987 - 1996 F150 & Larger F-Series Trucks
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Sep 30, 2023 11:00 PM