... usually 4.gearbox can also match with brushless motor Model:GM37-555PM 1.reduction ratio & gearbox length:1/6.25,1/10 ... available now; MODELVOLTAGENO LOADAT LOADSTALLOPERATING RANGENOMINALSPEEDCURRENTSPEEDCURRENTTORQUEOUTPUTTORQUECURRENTVrpmArpmAN.mKg.cmwN.mKg.cmAGM37-555PM 3554-106-1512.04900.44501.30.171.79.71.1117 ...