I had to replace a servo, so I got the Hitec HS-5646WP High Voltage, High Torque, Programmable Digital Waterproof Servo: Speed (6.0V/7.4V): 0.20 / 0.18 Torque oz./in. (6.0V/7.4V): 157 / 179. Should I use just this one or use the traxxas and the hitec together?