This is a good item to look for on antique truck sites /forums/images/graemlins/thumb.gif They are trying to get rid of them in 2wd pickups and go to 4.10 or 3.73's to make the older trucks better on road. stovebolt.com may be a good place to offer trading your current gearset for the 4.56 /forums/images/graemlins/thumb.gif