The battery pack and controller could be upgraded to 36 Volts and the motor would work with these new parts. However, when running at 36 Volts the original 24 Volt motor could overheat and burn out, so it would be best for reliability to upgrade it to a 36 Volt motor while making the conversion.
The throttle connector is the same on the standard Crazy Cart and the Crazy Cart XL.
Please let us know if you have any questions.
Gavin Costigan