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Welcome to the forum. Kind of an odd one, but not sure how a shock would interfere with the difference unless it is bottomed out to begin with. Shocks absorb shock while driving, and dampen its intensity. Even gas shocks do this, they just have a pressure in them to start with but function the same. I would check the air pressure, but mostly I would check the spring bushings to ensure they aren't worn, basically oval shaped which can allow more compression at the pivot point to make one side sit lower than the other.