Will a 03 expedition transmission work in my f150 if i rewire the harness?
What is your question?
So I put a 03 expedition 4x4 transmission and torque converter in my 2000 F150 4x4. Same transmission basically. Except 1 sensor so I snipped it from the expedition harness and wired it up to a empty hole on the comput.....under the hood.... all the other plugs where the same but I also broke the clips on some so I ziptied it.
It doesn't shift right and the speedometer says I'm flying when I'm not.
Is there not even a pin under the hood that it's hitting idk
RepairPal Certified shops can diagnose and repair your 2000 Ford F-150. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Hi, this is Bo, an auto expert on RepairPal's Car Genius team!
Swapping in that 2003 Expedition transmission might seem like a close match, but transmissions can be finicky when it comes to wiring and sensors. The mismatch in sensors and zip-tied connections could definitely cause shifting issues and confuse the speedometer. Rewiring or adapting sensors without fully matching the transmission control module (TCM) can throw the system off, making it act like you’re doing 100 mph when you’re not. You might be missing a pin or proper signal for the speed sensor. Double-check wiring and fluid levels first, but you might need a more specific solution like a custom tune.
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