DragRace Concepts Drag Pak Maxim Aluminum Top Shaft Gear. This 22t Top Shaft Gear is a replacement for the DragRace Concepts Drag Pak Maxim and Drag Pak Transmissions. This can also be used as an optional upgrade for the Traxxas Slash Transmission. This gear is machined from 7075 T6 aluminum and hard coated for long wear protection. Package includes one gear.