GM-39511 is a split plate used with GM-39547 Countershaft Press Adapter to remove the countershaft large bearing. GM-39511 captures the entire bearing to prevent damage to the bearing or any transmission components during disassembly. GM-39511 is placed around the countershaft large bearing, then placed on a press bed. GM-39547 is placed onto the countershaft bearing, and a hydraulic press is used to remove the bearing.