$50at TraxxasBuyTraxxasUPGRADE KIT 4-WHEEL DRIVE$50Traxxas$50BuySaveShareTraxxas profileThe creators who use it, or GearCred, may earn a commission when you buy through these links, at no extra cost to you.From Traxxas4-Wheel Drive upgrade kit (includes all parts to add 4WD to SportMaxx )