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05.13.2008, 03:20 PM
If things work fine in the air and only have issues when "loaded" on the ground, I too would suspect something mechanical (diffs/tranny/etc).
Although, it could also be a bad motor/power connection solder joint. When in the air, not much current is need so everything works fine. But on the ground, the increased power needed to move the vehicle increases the current. If the connector joints are crappy, you could get a cogging-like action.
The video is a little fuzzy, but the clicks do sound mechanical, not the motor, so I'd look at the diffs and tranny first.
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