Use of the proper lubricant for the steering knuckle bearings is very important. The lubrication section of the Jeep Service Manual specifies Universal Joint Lubricant #0 for winter and #1 for summer. This material is a semi-liquid grease. Unfortunately, this semi-liquid grease has not been available for some time. An acceptable substitute can be made by mixing chassis lube grease with SAE 140 gear lube until you have the consistency of cold molasses. A half pint of this should be pumped into each knuckle housing with a grease gun. A putty knife can be used to load it into the grease gun. Any lubricant thinner than that described above will leak from the knuckle seal. It will also work its way out into the hub area and contaminate the brake shoes. DO NOT use SAE 90 or 140 gear lube by itself as it is not the proper lubricant"
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