2006 Honda TRX680 Rincon Factory Service Manual, Page 487Get this manual
REAR DRIVING MECHANISM INSTALLATION Install new stopper ring into the groove in the inboard joint splines
STOPPER RING
Be careful not to Install the drive shaft by holding the inboard joint damage the oil seal until the stopper ring seats in the groovee gear caseaQpp seated properly by pulling on the inboard joint lightly
Pack the lip cavities of the inner dust seal with 2.5 of greaseSet the upper arm and shock absorber into the frame properly to fit the knuckle over the drive shaft