Aight, I've had my tranny, tcase, and diff fluids changed once already at the 24K mi mark I believe. I had the dealer do this and along with an oil change the whole thing cost $500. So I've been putting off have the fluids changed again (with the exception of the oil which I of course change every 3k) even though I've reach 47k miles. I'd like to save money by doing all of this myself but the "friction modifier" for the QD diffs scares me a little. Where do I get this friction modifier, what's it called, and how much do I put in? If anybody, has any ideas on what diff and tcase fluids I should use and where I can get this friction modifier I'd appreciate it.