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Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
If you start the vehicle, hold the brake pedal, shift to neutral. Then try to shift to 2wd will it then shift? Let me know these results before we get into diagnostics.
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If you remove the shift motor then command it to change gears does the motor turn?
Can you manually shift it into 2 high with the shift motor off?
Hello again Chris here,