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Jeep wrangler unlimited Rubicon 2008 how can you lock diff in 4 hi?

You cannot lock the differentials in 4Hi on a 2008 Jeep Wrangler Unlimited Rubicon. The Rubicon's front and rear locking differentials are only engaged in 4Lo (4-Low). Using the lockers in 4Hi is strongly discouraged and can cause damage to the drivetrain. 4Hi is for driving on loose surfaces or in slippery conditions where you don't need the extra reduction gearing of 4Lo, but still need increased traction.