o/d's came in 88/89. rh up til 95 and possibly some very early 96. not sure on the 96 model year. i have a 91 1/2 ton,318 tbi that has 518 rh WITHOUT lock up convertor. it is just a 2 wire. supposedly highly sought after as you can put reg convertor in it. i am going to take it out and put it behind a magnum in an 82 d150. not sure on the trans tunnel mods yet. getting ready to retire july 22 and will get started on 23 with that project. sorry that is all i have now. 360 should have bal wts on conv.