2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 447Get this manual
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FRONT DRIVING MECHANISM
Recommended oil
,Backlash difference Slip torque
175 cmJ (5.9 US OZ, 6.2 Imp oz) 220 em" (7.4 US OZ, 7.7 Imp nz] Hypoid gear oil SAE #80 0.05 0.