I looked into it a little more. Theh buggy and truck share the same chassis from what I can tell. besides the front suspension components you would need the bumpers and the roll cage which is made up of about 4 or 5 different part numbers. I cant tell if the rruck front shock tower will work with the buggy body. Oh, you also need the special body posts.
After I clean up some other RC projects I will likely convert my truck to a buggy.