Rusty_OToole Posted August 20, 2015 Share Posted August 20, 2015 What is the recommended gear oil for 1946 Nash transmission? Is modern 90 gear oil OK? I tried to do a search, but the search function only allows one word. In other words you can search for "oil" or you can search for "gear" but you can't search "gear oil". I did search and went thru 3 pages of replies but none came anywhere near. Link to comment Share on other sites More sharing options...
Grimy Posted August 21, 2015 Share Posted August 21, 2015 For my money, 90 weight is fine. However, the transmission and overdrive (if any) should get straight mineral oil, now known as GL-1, available at NAPA. This is NOT EP (extreme pressure) gear oil. Post-war Willys owners manuals with Borg-Warner transmissions specifically stated to use "straight mineral oil" in transmissions and overdrives, not EP oils which were recommended for differentials. For the diff, use GL-4 EP oil, NOT GL-5 as commonly found almost exclusively in parts stores these days. GL-5 is recommended for anti-slip differentials. And never use GL-6 (synthetic) in any unit with yellow-metal components. I learned that the hard way...a major lube company Ph.D. chemist was WRONG. Link to comment Share on other sites More sharing options...
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