A fiend just sent me an interesting report on testing different gear (transmission) oils. If this report has already been discussed, I apologize. I was just going to file it, however, I saw it included the Mopar synthetic oil we use in our transmissions. I have used the Mopar synthetic product for over ten years, but, this test report does not rank it very high.
If you do want to waste time, just go to the results. Page 19.
Study of Automotive Gear Lubes.pdf