Look for a new ESC, brushless motor. The battery you are running is a Dean's/T plug so look for batteries with that connection. You need to do a bit more research on what truck you have, what the motor size is etc you can't just expect us to guess everything for you. Look into the motor size and then look for brushless motors of that size, also look for a new brushless esc that is small enough to fit, and you'll also more than likely need a 3 wire servo of the same size and a new transmitter and receiver as I'm sure that esc is a cheap all in one reciever and esc.