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Anyone successfully relocated the sensor “externally”? Obvious purpose would be to avoid dropping the pan to replace the sensor when it goes bad. Secondly, eliminating the internal harness as a culprit of bad wiring for the dreaded check gage/flashing Tow/Haul light issue. Narrows the troubleshooting down a bit.
Immediate thoughts are, why would you relocate it when it rarely goes out. And when it does, it’s probably not a bad idea to change the fluid and filter anyway.
Thoughts? Anyone successfully done it? Would you drill and tap the case somewhere if there’s even a spot? Weld a bung on the pan? Is there a big difference in temperature from its current spot to in the pan?
The sensor doesn't have a threaded end. I don't know how you would put it externally and read the trans internal temperature.
Right - the drill and tap method is what I was thinking with a generic threaded temp sensor? Or even the same sensor that’s used for the oil and coolant temperature sensors for the 6.0’s. Either in the trans case itself or weld a bung on the pan. Would it not read the internal temperature fairly close to the same?
I went for it and started by making a jumper cable from the extra external trans harness from a F250 I bought off eBay. I depinned the 2 TFT sensor wires and stripped them from the harness. I swapped the pinned ends from the PCM side connector and the other ends to a GlowShift temp sensor I bought and installed in the pressure test port. 1/8”x27. With this setup, truck runs just like stock. I did this to troubleshoot a suspected bad internal wiring harness. It worked great. It’s also an alternative to relocating the TFT sensor to the outside of the transmission.
NOTE: This specific GlowShift sensor runs a little higher (hotter) than the stock TFT sensor by about 15-20 degrees. I knew this going into it, but the purpose was to troubleshoot a bad internal trans harness and to see if this worked without any other “side effects”. I will be trying to find a closer range sensor to swap out.
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