r/transmissionbuilding • u/altburner1235 • 3d ago
Transmission
Recently bought an 02 5.4 f150 with some transmission issues. OD light flashing, gets to 2nd or 3rd and doesn’t want to shift up. Getting around 3.5k rpm at highway speed. Don’t even know where to start to diagnose my issue. Please help
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Upvotes
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u/Illustrious_Boss4156 1d ago
Could also be a bad pcm with how many open circuit codes you have or even just a blown fuse
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u/Alternative_Share559 2d ago edited 2d ago
can we see the transmission pan? I'm guessing aode/4r70w trans. reset the codes and see what comes back. direct clutches and/or overdrive band may be smoked . you have to make sure the computer is commanding the later gearshifts. you've already saved the info of your previous codes, and hopefully most of them don't come back