How to UPGRADE Pinion Gear In The Arrma Granite Grom/SPEEDRUN 

I got my cousin BB the Arrma Granite Grom. Its great 1/16 scale RC monster truck. BB loves his RC car but wants to go a little faster. I went to the hobby shop and bought a new pinion gear for his car, and I am going to show and teach you hoe to change the pinion gear in the Arrma Granite Grom.
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