My 85 has 1,237,XXX first engine was rebuilt 2 times before I built a new engine for it at 1,236,XXX. The W56 trans is still in good shape but I exchanged it for a r150/r151f hybrid when I went to duals. Both Diffs made the million but have been changed out with a Hi-pinion in the front and a V6 in the rear.
