It would be cheaper to fix the SLS as-is. The most expensive item are the hydraulic rams, which rarely fail, at $400/each.

After the cost of switching to a regular power steering pump, there is almost no point.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k