2009-2011 Honda FourTrax Rancher AT TRX420FA/FPA Service Manual, Page 347Get this manual

2009-2011 Honda FourTrax Rancher AT TRX420FA/FPA Service Manual, Page 347

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AUTOMATIC TRANSMISSION four bolts valve body

Wash all the parts with high flash point or non-flammable solvent and blow through all oil passages with compressed air to clean completely