This is the replacement Differential Pinion Gear and Shaft for the Associated Monster GT This part is used in the front and rear gearbox and is supported by two 8x16x5mm bearings (ASCC9716). FEATURES: Steel construction Gear and shaft are integrated (one piece) INCLUDES: One 13 tooth pinion gear with shaft REQUIRES: Assembly into the front or rear gearbox following the manual that came with the original kit kpm11/11/2003 ir/jxs