1993 GMC Jimmy Owner's Manual - Page 287

Rear Axle When to Check and Change Lubricant: Refer to the Maintenance Schedule to determine how often to check the lubricantandwhen to change it. See"ScheduledMaintenanceServices'' in theIndex. How to Check Lubricant: KO996 If thelevelisbelowthebottom of thefillerplughole,you'llneed to add some lubricant. Add enoughlubricanttoraisetheleveltothebottomofthe fillerplughole. What to Use: RefertotheMaintenanceScheduletodeterminewhatkindoflubricantto use.See"RecommendedFluidsandLubricants"intheIndex. Four= Wheel Drive Mostlubricantchecksinthissectionalsoapplytofour-wheeldrivevehicles. However,theyhavetwoadditionalsystemsthatneedlubrication. Transfer Case When to Check Lubricant: Refer to theMaintenanceSchedule to determine how often to checkthe lubricant.See"PeriodicMaintenanceInspections"intheIndex. 6-21