This is the replacement Input Shaft/Drive Gear Assembly for the Traxxas 3905 E-Maxx Truck. FEATURES: Steel shaft, black in color Steel drive gear assembly, silver in color YOU WILL RECEIVE: One Input Shaft with 18 Tooth Top Gear REQUIREMENTS: Installation following the model manual SPECIFICATIONS: Shaft Diameter: 5mm Shaft Length: 3.53" (90mm) Thread Size: 4mm kpm02/05/2008 ir/jxs &