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What happen in the design is that the Fisher Price's output shaft is attached onto the back of Drill motor's output shaft. So, together, the two motors push on the combined shaft, transfering both motor's mechanical power into the drill transmission, and eventually onto the wheels.
That is why there're two nut shape attachment on each of the output shaft, and a coupler joining them.
So, this is really a 4 motors drive train with a conventional tank design. The only draw back is that there is no room for gear reduction on the fisher-price motor to change it into the same speed as the drill motor...
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