2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 368Get this manual
FRONT DRIVING MECHANISM GEAR TOOTH CONTACT PATTERN CHECK Keep dust and dirt out of the case and cover
Clean sealing material off the mating surfaces of the differential case and cover, being careful not to damage themApply thin coat of Prussian Blue to the pinion gear teeth for tooth contact pattern checkInstall the left ring gear shim onto the differential assembly
LEFT SHIM
Apply Prussian Blue Install the differential assembly into the gear caseInstall the right shim onto the differential assembly
RIGHT SHIM
DIFFERENTIAL ASSEMBLY