Just a note to keep in mind, the V2 chassis requires a spacer on the gear shaft. This spacer is included with the aluminum motor mount (54609), but not the chassis parts. This may be the cause of the lateral movement of the gears on some people's cars if they upgraded just the plastic chassis parts.

Note the spacer in the top of the (poorly) scanned instructions below:
https://fiveeight0sixsix.files.wordp...structions.jpg