2005-2011 Honda FourTrax Foreman TRX500 FE/FPE/FM/FPM/TM Service Manual, Page 378Get this manual

REAR DRIVING MECHANISM
TROUBLESHOOTING
Excessive noise Worn or scored ring gear shaft and axle Worn or scored pinion and splines Worn pinion and ring gears Excessive backlash between pinion and ring gea rs

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