11.FINAL REDUCTION/ TRANSMISSION SYSTEM MXU 550EXi/MXU500i Install the front drive shaft. Nut Front Drive Shaft Hold universal joint nut by using a suitable bar, then remove the rear propeller shaft nut. Bar Universal Joint Remove the rear middle joint. Rear Middle Joint Output Shaft Tap the output shaft by using a rubber hammer, then remove the output shaft, secondary driven bevel gear and shim. Secondary Driven Bevel Gear/Shim 11-4