Gearing?
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a quick and dirty starting point if the truck is currently geared stock with a stock spur is to run 2 teeth less than the turn or so. What is in there now a 20 or something? Anyway you might try a 17 tooth pinion and adjust from there. You don't want the motor getting over 150 degrees or so at the end of a run. So gear it accordingly where you have a good mix of temp and speed etc.