Loosen the tension on the lower control arms ( I always count the turns or mark the tension bolt for adjusting the height later). Remove the clip and slide back the bars. Be careful not to nick or damage the skin on the bars. If stuck, I wrap a rag around the bar and use vice grips to shake or tap the bars out. They be have grease cups on the inside of the bars, replace if damaged. Note: If you are changing the motor size (block) then you should change the size of the bars.
