Good evening, the way to remove the shifter knob is to unscrew it by turning it counter clock wise. The shifter shaft is treaded, this is the reason why it unthreads. So grasp it firmly and turn
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Here is a link showing it being threaded:
Here is a link as well to a forum discussing this:
A good 95% of the vehicles have the screwed in shifter knob...in rare cases, it pulls off once the lower plastic trim ring is released from the shifter knob as descirbed in the last forum link. Odds are that it is the screw on handle....it will be tight to turn.