2WD trucks run normal 540 sized motors and speedos as used in 1/10th buggys,
Depends what size/type your existing motor/system is and what truck you plan to use it in whether it is suitable, some trucks won't handle a high power brushless system well, it'll mess the handling up or destroy the transmission
4WD's really need 550 motors or 4 pole 540 sized with large capacity speedos and high mah/c rated lipos to get the best from them, they are heavy and with larger wheels than buggys they use a lot of power.
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