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I initially also suspect the inside front tires will hit the frame rail more easily.
As a learning moment for me....why would this be?
Fast ratio arm(s) on a FF box or Borg. box....wouldn't the physical travel of the arm(s) through space be the same (assuming the Borg. box pitman shaft exits the box at the same point in space as the factory / FF box)? You might get there (the frame rails/end of travel) quicker/sooner with the Borg. box due to a faster internal ratio, but wouldn't ultimate travel be the same? 
We're getting dangerously close to the limits of my thinking here... 
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