2005 Kawasaki KAF400 Mule 600 and Mule 610 4x4 Service Manual, Page 177Get this manual
9-8 TRANSMISSION Specifications
Item Transmission Oil Type Viscosity Capacity: KAF400-AC KAF400-B Oil Level Transmission and Shift Mechanism Shift Fork Ear Thickness Shifter Groove Width Reverse Chain 20-link Length 2WD4WD Shift Mechanism Shifter Block Outside Diameter Shifter Groove Width Differential Gears and Shift Mechanism Shift Shaft Pin Diameter Shifter Groove Width Standard API "GL-5" Hypoid gear oil SAE90: above 5C (41F) or SAE80: below 5C (41F) 2.4 (2.5 US qt) 2.2 (2.3 US qt) Between and lines on dipstick Service Limit