Quote:
Originally Posted by SuperNerd256
If 2 of those weigh less than one of the standard transmissions, it'll be less weight no matter what. Plus, you gotta admit: Just by seeing it you wanna use it on a robot. 
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If designed right the additional weight going from a single to two motor gearbox is a little more plate, and an additional pinion gear; far less than a second set of gears.