I don't really know how the weighing works. I just changed my diff oil in my buggy to 5k, 7k, 3k. 5 in the front, 7 center, and 3 rear. The weights are just different viscosity ratings. So just take out your diffs and clean them out. Don't fill your diffs all the way up. Fill it up to the top pin. You will know what I mean when you take it apart and see the two pins that hold all the gears on.