In my truggy and I changed out the stock diff fluids from when I got it to 10k center 7k in front and 3k in rear. It seemed like it did not make a difference the first couple of times I drove it but now it wants to fishtale alot and spin out in the turns and I mean pretty bad. Also when I come out of a turn and into the straight when I am able to hit the throttle all the way it swaps side to side pretty good like it wants to come around but does not. I have checked the front diff already and everything is fine and it is not in 2wd, its not that bad. I still am not too familiar with what the different fluids do. I think I should change the rear diff fluid to a thicker but how much? If I change it to 5k will that make a big difference since I had 3k in it already? I am thinking of putting 10k in it. Or should I change the center diff fluid which I think really only tunes the front wheels. Please help!