Hi Elsy,
Looks like that is the wiring harness that goes to your O/D button on the shifter.
Here is the procedure but if you don't need to take the shifter apart, you can unhook it from down on the transmission and just pull it out as one piece. That may be easier.
Let me know if you need more info or help and I can get it for you.
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Friday, May 3rd, 2019 AT 1:26 PM