In the early 90's I looked for a rear sway bar. I couldn't really find one. Then Sport Truck magazine's truck of the year in 1993 had what I needed. They're nascar style sway bars with splined ends, steel lever arms, heim joints, bronze bushings. They make a huge difference, but they're not really cheap. The bar in the rear is a 1" solid bar that goes through holes drilled in the frame forward of the differential. The winning truck is from Benchmark Fab in Corvallis, Oregon. He may still sell these bars, but not sure as this was 25 years ago. Speedway Engineering sells the parts for these bars. You just have to get them to fit. best of luck!