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Greg, this doesn't make much sense to me.  If one wheel is spinning faster, the Torsen will begin to engage without any electronics.  What you are describing with the brakes being applied by the traction control is how vehicles without a mechanical means of a limited slip can control wheel spin.  The Torsen should work the same way all of the time with 4wd engaged and should not require help from the traction control unless a wheel is off the ground or has very minimal traction.  Maybe in severe ice or very loose sand this might be the case.