I received my replacement from Charles Ro and it is much better that the one it replaced. I would suggest checking ALL the screws. It still had some gear noise and I found that one of the screws that goes through the bottom of the truck to hold the motor in place was screwing into the truck and then the motor. I was able to correct that and thread both screws into the motor only to hold it in the correct position in the truck. Now I can't hear the gears over the sound of the wheels on the track.
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