dieseldoc Posted December 12, 2018 Share Posted December 12, 2018 Afternoon gents. I have a 4R100 in a 2001 f550. Servicing the trans And you can no longer buy Mercon from Ford for some time now. I know there was a big controversy back in the day about using mercon v in a 4r100. I have been told that it will fry the clutches(independent trans shop) was told is compatible now just pour it in(ford parts Dept). Was told to Drain, change filter, flush 4-6 quarts through when you refill via the return cooler line at the back of trans and you will be good to go ( ford service Dept). Looking for an answer from someone or group in this case I can trust. What have you guys seen with this scenario, what’s your preferences?? Quote Link to comment Share on other sites More sharing options...
RyanG Posted December 12, 2018 Share Posted December 12, 2018 Been using Merc V on the old mans 03 E350 with 4R100 since new flushing every 30k. Has 390K miles and I have never even had the pan off. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted January 5, 2019 Share Posted January 5, 2019 I know we discussed this years ago... it seems there was always a big to-do about using the correct fluid and what you must never do. Words from Ford. Then one day we were told that MERCON 5 was all of a sudden magically backward compatible with everything that was no longer available. I just would n ot use it forward in any trans requiring synthetic premium like SP, LV and whatever else comes at us in the future especially in a heavy duty trans like the Torqshift models. Quote Link to comment Share on other sites More sharing options...
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