[Dennisfly]

I just did this with a full length spreader, the car on jack stands at the frame just behind the rear running board bracket, and a floor jack under the differential just to replace one shackle. The procedure is in Les Andrews' red book. There is a lot of power in that spring. The spring spreader was beefy but it was bowed like a barbell with a guy lifting 500+ pounds. I had to get a pipe extension for leverage to turn the nuts on the spreader. I also had to use a pry bar to to extend the other installed shackle to the horizontal position for maximum length to reach the second shackle. It worked, but it made me nervous. Be careful and use the right tools. I changed a bushing and I could not have done it without the bushing driver tool (about $10 online).