Lucas Oil products 75w140 rear axle lubricant that can be used on many heavy-duty Ford applications. The part number is 10121 and it is synthetic. Lucas SAE 75W-140 Synthetic Gear Oil is a non-foaming, super slick, long-lasting lubricant designed especially for heavy-duty or high-performance applications. API service GL-5. This is sold by the quart. 

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