E4ODs are only as good as you treat them. Just sold my 1993 F250 HD with 235000 and trans still worked perfect. Two owner truck has been manitained by me since day one. C6 is stronger but no overdrive. 17 years a Ford Trans Tech. 10 Years working for myself. Going to put a E4OD in My 64 Galaxie behind a 460 in a couple of years.