The different modes do have different torque distribution. If the ptu sends power to the rear, it takes it away from the front. The settings for the various modes are defaulted to 60/40 40/60 etc, no slip needed.
Please provide your schematics first that show it is always powering the front 100% till slippage...until then, I will go with the jeep engineers on this one.
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Last edited by clew; 02-24-2014 at 12:02 PM.