Originally Posted by LonnieC
I believe that GL-4 gear oil should be used in the gearbox to prevent damage to the yellow metal components ... not GL-5.

We used to call it "mineral oil" as opposed to hypoid lube that's intended for the spiral-contact gears in a rear axle. Hypoid lube has some additives that aren't bronze-friendly, particularly in air-shifted situations like the range splitters on Fuller Roadranger transmissions. It can't hurt to use the same stuff in a less-stressful application.
Jerry

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