Gear slips into neutral

Are you driving it with the steering coupler like that??? If so, you've got bigger nuts that I do. You may want to get that fixed. It's missing the shoes/spring and the pin should be midway into the coupler body, not out towards the end like that (there's a spec in the FSM - I think it's like 13/16" from the tiny hole in the shaft to the top of the coupler body?).

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I drove it like that for 6 months just fixed that problem made driving fast fun.