Can you please tell me in detail what your Blushless setup is? ie motor, battery, esc?
Mine has the Typhoon Brushless motor which bolts right up to the Spit gearbox. Swap the pinion from the Spit brushed motor and install with green loctite. I drive the motor with a Castle Creations 35amp ESC and a TP2100mah Lipo. Receiver is a Spektrum 6100.
Gary