Sparky Posted December 15, 2021 Share Posted December 15, 2021 I will need to service my AOD soon. Not sure what the PO used for ATF. The dipstick says Dextron II. I read a post on another forum that made a convincing argument for Mercon V and said that Dextron VI is not backwards compatible. Here is the thread: https://www.ford-trucks.com/forums/1625085-1986-5-0-aod-transmission-fluid-dipstick.html Right now I'm leaning towards Mercon V. What do others use? Also, I believe the torque converter does not have a drain plug. Should I not worry about the fluid in it? Thanks Link to comment Share on other sites More sharing options...
ratdude747 Posted December 15, 2021 Share Posted December 15, 2021 Dex/Merc is what I used last time... Mercon V is good too if you can find it (but isn't strictly required unlike in later applications). Do not use Type F or Mercon LV!!! Specifically I bought 3 gallons of Valvoline Maxlife Dex/Merc. The TC does in fact has a drain plug... hidden between flexplate bolts (there's a cutout in the flexplate for it). I think it took 10 quarts with the TC drained.. so 2.5 gallons, but it was cheaper to buy 3 1 gallon jugs and only use half of the last than to buy 2 1 gallons and two separate quarts. Gotta love bulk walmart pricing. Link to comment Share on other sites More sharing options...
Sparky Posted December 15, 2021 Author Share Posted December 15, 2021 Dex/Merc is what I used last time... Mercon V is good too if you can find it (but isn't strictly required unlike in later applications). Do not use Type F or Mercon LV!!! Specifically I bought 3 gallons of Valvoline Maxlife Dex/Merc. The TC does in fact has a drain plug... hidden between flexplate bolts (there's a cutout in the flexplate for it). I think it took 10 quarts with the TC drained.. so 2.5 gallons, but it was cheaper to buy 3 1 gallon jugs and only use half of the last than to buy 2 1 gallons and two separate quarts. Gotta love bulk walmart pricing. I just called a Ford dealer and they recommend Mercon V so that is what I will go with. Good to know that there is a drain plug in the TC. Link to comment Share on other sites More sharing options...
Sparky Posted December 15, 2021 Author Share Posted December 15, 2021 Dex/Merc is what I used last time... Mercon V is good too if you can find it (but isn't strictly required unlike in later applications). Do not use Type F or Mercon LV!!! Specifically I bought 3 gallons of Valvoline Maxlife Dex/Merc. The TC does in fact has a drain plug... hidden between flexplate bolts (there's a cutout in the flexplate for it). I think it took 10 quarts with the TC drained.. so 2.5 gallons, but it was cheaper to buy 3 1 gallon jugs and only use half of the last than to buy 2 1 gallons and two separate quarts. Gotta love bulk walmart pricing. FYI, the label on the Valvoline Maxlife Dex/Merc says it is Dextron VI/ Mercon LV, so I think they are equal. Link to comment Share on other sites More sharing options...
ratdude747 Posted December 15, 2021 Share Posted December 15, 2021 FYI, the label on the Valvoline Maxlife Dex/Merc says it is Dextron VI/ Mercon LV, so I think they are equal. I think that's the stuff. https://www.valvoline.com/our-products/automatic-transmission-products/maxlife-multi-vehicle-atf Supposedly per their FAQ that is mercon V compatible: https://www.valvoline.com/about-us/faq/system-fluids-faq I don't have the containers any more (got used and tossed for old fluid, used the leftover jug on something else)... and I'm out of the country on business. Link to comment Share on other sites More sharing options...
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