Rob Posted December 19, 2008 Share Posted December 19, 2008 I've got several differentials, and transmissions that I plan to service in the near future. All are older with the newest being a 1978, Most are Mack. The exceptions are a single Fuller, (RTO12513), and a Brownie, (6231D), and a set of Rockwell rears.Would 80W-90 meeting the GL-4 spec be good, or would GL-5 be better? Or a combination of both?I know Glenn will know this from experience.Thanks,Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment Share on other sites More sharing options...
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