2001 - 2007 Chevrolet GMC Silverado Sierra 2500 3500 29 INPUT SHAFT SPLINES. 31 OUTPUT SHAFT SPLINES. FRONT OUTPUT TYPE: 1.608" O.D. FEMALE. REAR OUTPUT TYPE: SLIP YOKE ELIMINATOR (SYE). ELECTRIC SHIFT.; TAG: 12573382, 12575648, 12576352, 12579909, 12581004, 12584758, 12585237, 12588516, 15005450, 15772805, 24228411, 24238188, 24238841, 24228417