I've had mine jerk forward when activating the transfer case motor (in park) using my Foxwell NT-510 and after replacing the gear it's never done it again. Not sure why then...

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course