I purchased an 87 GN complete rear a while back. It has a tooth broken off the ring gear. My plan was to repair it and then sell. With moving twice recently, time has not been there. It is for sale "as is" . I have 2 ring and pinion sets that go with it. A 3.73 and a 3.42. There was moisture inside the cover when I last inspected it. It is dry now but I would suspect the posi unit may be DEAD.----Pick up in BG. $600 FIRM.