1995-2003 Honda Foreman TRX400FW TRX400 TRX 400 400FW Service Manual, Page 285Get this manual
FRONT DRIVING MECHANISM PINION Measure 'he pil1'Ol1 gear 1.0and pinion shaft 0.0Sl:RVlCE UMrTS:
PINION GEAR I.D 12:.05 mm [O.4H Ill) PINION SHAFT .0 11.7S mm (0.4631"1
CIeck the side wash"r for wear Or damag"
DIFFERENTIAL HOUSING
Cheel 'he slOIS for wear Or damage