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traxxas revo 3.3 best gear ratio for trencher x

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So I changed the spur gear to 40 tooth but I still don't have the bottom end I want my engine seems to be tuned right and also when I run it for awhile I think it heats up the clutch to much and revs high but moves fairly slow so I think the tires are just to much for the stock set up just my opinion but thought i would open it up for discussion any thoughts
 
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