View single post by Steve Duncan
 Posted: 09-28-2017 03:15 pm
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Steve Duncan


Joined: 09-12-2011
Posts: 12
Thank you for your response. I have a four speed and have always used Valvoline 20-50 racing oil in it. My question has been what to use in the differential. I know it calls for an EP 90 wt. But I am unclear if I need to be concerned about sulfur content. As I understand it, sulfur content can affect "yellow metals": any bronze or brass parts. I know the four speed transmission has bronze syncos in it, but I can't seem to get a clear answer if there are any bronze or brass parts in the differential. I've never rebuilt one, so I've never seen the internals. Thanks