I was under the impression that standard diffs will do exactly opposite of this. When you lose traction the diff can unload and when it does all the power goes to the wheel(s) with the LEAST amount of traction. This is the reason you use heavy weight oils in the standard diffs, because it keeps them from unloading longer. Torsen diffs are the ones that send the power to the wheels with the most traction and you do not need to worry about different weights in them. I'm definitely not positive on this, but this way it does make a little more sense to me why torsens are so expensive.