I emailed SSB about a year ago, and they did not have a kit for the 84, but they might now. I know there was a dude at www.blueoval.com that made his own kit for about $100 for the Ford 9". He also posted a link at Ford Truck Enthusiasts (www.ford-trucks.com). Also, check with Summit Racing Equipment to see if they have something to offer now. You can use GM rotors but the caliper-mounting brackets will have to be fabricated to fit the Ford axle. Post up what you find out!!!