1. Identify your rear axle: Look for a tag on the differential housing. It will usually indicate the axle type (e.g., Sterling 10.25, Dana 50, etc.). The tag might be located on the top or side of the differential.
2. Consult your owner's manual: Your owner's manual will specify the recommended lubricant for your specific axle.
Without knowing the axle type, I cannot give you a definitive answer. However, many Ford F-250s of that era used a high-quality SAE 80W-90 gear lubricant or a synthetic equivalent. Some might even call for a limited-slip additive depending on the differential configuration.
It's crucial to use the correct type of lubricant. Using the wrong grease can damage your rear axle components and lead to costly repairs. Always refer to your owner's manual or a reputable parts store (providing your axle type) for the most accurate recommendation.
