Hi you need to brace the gearbox one way or the other the main two ways are either top of gearbox to battery strap or the little L shape bracket that fits to the motor plate then to chassis you MUST brace or you will keep stripping the front screws at the front of the gearbox under power.
Gearing for the cr2 is mainly 78t spur with the external idler gear i ran 24t pinion with a 7.5 motor.
Hope this helps matey.
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