This is the Primary Gear Shaft for the Traxxas T-Maxx 4WD Radio Control Monster Truck. This shaft installs between the spur gear and the primary gears in the gearbox. FEATURES: Replaces stock gear shaft. Constructed of steel. INCLUDES: One gear shaft REQUIRES: Diassembly of gearbox and installing shaft between the spur gear and the primary gears. JXS 12/19/00 ir/jl BOX DIMENSIONS: 2.50" W. X .25" H. X 3.00" L. BOX WEIGHT: .03 LBS.