2005 Kawasaki KAF400 Mule 600 and Mule 610 4x4 Service Manual, Page 223Get this manual
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11-6 FINAL DRIVE Specifications
API "GL-5 or GL-6" hypoid gear oil for LSD (Limited Slip Differential gears) SAE90 (GL-6) or SAE140 (GL-5) 0.4 (0.4 US qt) Filler opening level 4.9 13 Nm (