Fabio,

Received your query about the Jamara motors. They are too big for our tanks. Even the lower powered Jamara 480 HS Pro motors have enough power to rip the rear idlers off the tank and make it hard to control with older El Mod using HL radio. If you're using 3-1 gearboxes, stick with Speed400s. The older El Mod was calibrated to work with stock gears and Black Capped Suntech Motors which are slightly less powerful then Speed400s.