I changed my rear bushings to stop the rear end wobble/waggle.....The old bushings were shot, the new ones went in fairly easy....The hardest part was removing the bolts that held in the old ones. I had to hack saw off the nut and bolt...what a pain in the ass.....!!!!
If you replace these...one tip is to remove the spare tire from under the truck and leave the truck on the ground...don't jack it up...you'll have a good amount of room underneath to work if your truck is stock height and tons of room like me, if you have a lift already installed