Re: if you havnt changed you rear end gear oil since the 70's you may have this...
Let Me Explain It This Way, With All New Gears It Is A Wise Idea To Run Syn. But With Gears With Age And Miles On Them, The Strength In The Metal Has Weakened Over Time. So The Thicker The Oil The Less Heat It Builds. Lucas Works Well In Keeping The Gears Lubed And Keeping Down Heat For More Life
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