Kfigel Posted January 22, 2023 Share Posted January 22, 2023 Looking to change out the diff fluid in my '22 Big Six. Can't find what was originally called for in my service manual. Can anyone suggest what grease/fluid to use? Thanks Link to comment Share on other sites More sharing options...
Stude Light Posted January 28, 2023 Share Posted January 28, 2023 It uses a spiral bevel gear so no need for any hypoid lube. I would suggest using 600 wt (SAE 250) gear lube as it tends to stay inside the housing. A number of vintage car parts suppliers carry it. This is what I use in my cars. https://www.lubriplate.com/Products/Fluid/SPO-Series/SPO-299/SPO-299/SPO-299-1-QT-BTL Link to comment Share on other sites More sharing options...
Kfigel Posted January 28, 2023 Author Share Posted January 28, 2023 Got it and thanks, Scott. Link to comment Share on other sites More sharing options...
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