1998-2001 Honda Fourtrax Foreman TRX450S, TRX450ES Factory Service Manual, Page 316Get this manual
REAR DRIVING MECHANISM
TR, UBLESHOOTING O
REAR FINAL DRIVE
Excessive noise
Worn or scored ring gear sh aft and driven flange Scored driven flange and wheel hub Worn or scored drive pinion and splines Worn pinion and ring gears Excessive backlash between p"nion and rin gear Oi level too Ilow