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5. The new cover has a filling hole and a drain plug for easy service in the future. The new fill hole is a bit higher than the factory one so make sure to pull the factory plug and fill the diff through the new fill hole till it runs out of the factory fill hole. We used Royal Purple’s 75-90 Max-Gear. This stuff combines synthetic oils with Royal Purple’s proprietary Synerlec additive technology. All viscosities of Max-Gear are formulated with hypoid friction modifiers necessary for use in clutch or cone-type differentials. No additional additives are necessary.