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GL-1 helped my tranny and transfer case shift better than whatever was in there and the tranny does not pop out of fourth gear going downhill (as often). I'll consider GL-5 in the differentials at my next oil change. I was going by the LO, but I concede that there has been a lot of development...

I buy the 5 gallon buckets of good old fashioned GL-1 90wt gear oil at my local auto parts house. I hear tractor supply places sell it as well. You also might want to get the bucket pump at Northern Tool or Harbor Freight, as it will make your life so much easier.