[mclairmo]

You could just leave a jack under the lower control arm to keep the spring in place. For added security you shoud chain the coil to the frame so it won't launch itself should the jack slide out. Or, Harbor Freight sells an inside spring compressor for not much money that will work to compress the spring and keep it from popping out. Parts stores might rent them out, too. Just be sure to not get the outside type. I would think it would be easier to replace the bushing with the arm off the truck, but you amy want to loosen the upper bushings with the arm on the truck. There are two bushings per arm.