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Best gear oil for 4 speed


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I am ready to fill my 4 speed nonsynro transmission in my truck. I believe that I need a GL-4 oil and SAE 140 since I won’t drive it in the cold. It appears that 85/140 is all that is available which is fine. Which brand of oil has worked best for you guys?  I’m leaning toward Valvoline because it has the EP additives required in the manual. 

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I've been an Amsoil user for many years, so that's what I'm using in my truck gear box. However, what you are looking at is just fine. I believe the original spec was for a GL-1 gear oil, which isn't easy to find these days. However, your GL-4 should be find in your spur gear trans. 

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Would synthetic be ok?  Valvoline has a conventional oil. 

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Turns out that the Valvoline is GL-4 and GL-5. With my non synchronized transmission is it ok the have the 5. Masterpro makes a straight 140 that is GL-4. I can order it from oreillys in a gallon for $22. I don’t know anything about this oil brand.

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I don’t but I sure wish I did. 
 

Happy Thanksgiving 

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2 hours ago, Mertz said:

I don’t but I sure wish I did. 
 

Happy Thanksgiving 

I think they'll ship but it's probably $$

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Oriellys has GL-4 SAE 140 in a gallon for $23. It’s Masterpro that I never heard of and couldn’t fine any information on it. I’m using it and also putting in my steering box. Not driving in the winter so I don’t need 85/140. 

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