Question with a little setup.

I have the Copperhead-R installed in my SC10 4x4 and had it running the Castle 1410 1Y 3800kv motor.

My son has an SC10 with a Castle Sidewinder V2 running the Velineon 3500kv motor. The esc in his SC10 was failing so I was going to buy him a new one. After finding out how great the Copperhead-R esc is I opted to get him one of those. Instead of just getting the ESC I decided to go with the Copperhead-R ESC & VX4R.45 4-Pole 550 Sensorless Brushless Motor Combo (4500kV).

So I bought the combo and put the esc in his truck and the motor in my SC10 4x4.

Now the question.

Is the VX4R.45 motor typically loud (high pitched)?

I used the same gears that were on the Castle motor which ran quiet. It sounded like the gear mesh was off and would squeal as if the mesh was too tight. I loosened several times even to the point that it was barely meshed but the loudness was still present. I even put a set of brand new pinion and spur gears on to eliminate that as a possibility. I also put the Castle motor back in and it was back to being quiet. If I pull the motor back and just let it run with the pinion it is still just as loud and squeally. Just hand turning it the motor feels smooth.

So back to my question, is the VX4R.45 motor loud?