EUREKA Posted July 8, 2022 Share Posted July 8, 2022 While shopping for a pinion seal, for the Dana44 in my MJ, I noticed a marked price difference between two National brand seals. 53% price difference from rockauto. National Seal Part Numbers: 5778 and 5778V The only difference between them seam to be material. What do you guys think? Anyone familiar with theses materials? I found a webpage that gives a comparison of the two materials, but the reason for the higher cost of the FKM is not immedatly apparent to me. https://www.makeitfrom.com/compare/Fluorocarbon-Rubber-FKM-FPM/Polyacrylate-Rubber-ACM/ Link to comment Share on other sites More sharing options...
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