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Gear oil for rear axle


Ward Duffield

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GL 4 and GL 5 are important topics for manual transmissions because of yellow metals used in earlier transmissions. For that application I used MT 90 manual transmission oil and it made a noticeable difference in shifting especially cold. My transmission is a std. 3 speed. 

 

As to your question, any GL 5 90 wt. hypoid gear oil is sufficient. GL 5 is the most common now. 

 

Adam

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Just now, Plymouthy Adams said:

The GL1 is available for approx. 15.00 a gallon at your local NAPA and the gallon is the smaller container....even if they do not have it on the shelf, they can get it in for you fairly quickly if your local store has good management.....

I have ordered the GL1 through our Napa store to use in my 52 Mercury overdrive. It's what I will use in my 49 special deluxe too. 

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I had the NAPA GL1 oil prior to trying this, it worked fine.  After trying the MT 90, I'm glad I spent the money.  It worked much better especially cold.  Trans doesn't hold much so it's not too hard on the budget.  Your call, but sometimes it's good to open your wallet a little and blow the cobwebs out.

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