With stock 2400 battery, I got 37.75mph gps, and with 3000 nimh I got 38.65mph. Crazy durable, recommend checking slipper clutch so it doesn't break drive shafts. Tighten wheel nuts, and check often. Loctite is friend. Very fast and powerful truck. I keep up with and sometimes beat 4x4 stampede on track in straightaway.