I have had my 86 for 12-13yrs and it has almost 200,000 miles on the AOD and I have only changed the fluid once at the same time I installed a shift kit in it when I bought it. I have shown it no mercy in all these years and it still works great,I trust it a lot more then the ED4OD in my 93 Bronco and that only has 80,000 on it.