welldigger
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Gl-1 is NOT the best lube for the tranny and transfer case. It is a very primitive lubricant which is why it is so hard to find. Almost nothing uses it anymore. Spicer specified 30wt non detergent motor oil. 30, 40, 50wt are all acceptable depending on your average ambient temperature. Gl-5 gear lube should be put in the axles.For GL-1 head over to tractor supply 17.00 for 2 gallon jug, I am still concerned about using the newer lubes in the older transmissions and transfer cases, as they were designed for the old mineral oils. Any help or black and white research on the subject would be greatly appreciated