Attention: TDR Forum Junkies 
I just got done changing out rear differential fluid (Red Line 75w-90) and added a little additive (Red Line Friction Modifier) 2 ounces worth. Went for a short drive, made lots of turns and the vibration seems to be gone. Not sure if its the fresh fluid or the additive? Last time I changed rear diff fluid was 31,000mi ago. The fluid that came out this time did not look or smell good at all. It kind of looked like it had been contaminated with water/dirt? I looked over the axle vent, gasket, etc. and everything appears good and normal. I will try to attach a pic of what I was looking at.....
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