2006 Honda TRX680 Rincon Factory Service Manual, Page 458Get this manual
FRONT DRIVING MECHANISM Separate the other drive shaft from the differential as you remove itRemove the differential assembly from the frame
DIFFERENTIAL DISASSEMBLY INSPECTION
PROPELLER SHAFT INSPECTION
Remove the boot band and boot from the propeller shaft joint, and remove the propeller shaft joint and springPROPELLER SHAFT BOOT BAND
BOOT Check the splines of the propeller shaft and joint for wear or damageIf damaged, check the output shaft and the pinion joint alsoCheck the seal rubbers for fatigue or damageCheck the boots for cuts, deterioration or damage