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1955 Buick differential cover gasket


Mudbone
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I've usually just used black RTV to seal up the differential cover on my cars. It isn't correct for a vintage Buick but it was how the factory did it on my 1993 Mustang so that's how I usually do it even on old cars. My '41 Buick and '35 Lincoln both sealed up with RTV without issues. Do it right and it's invisible and should last at least as long as a cork gasket. Just make sure your mating surfaces are clean and the differential cover is as flat as possible (sometimes the bolt holes get pulled a bit). 

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