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Discussion Starter #1
I am ready to install my valve body and do a tranny flush. I have been reading for a few weeks on what fluid to get. I called ford and they said mercon V only reading on here people say thats not good for my truck. What do I need will mercon/dextronIII or amsoil atf work anything comparable?
 

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Discussion Starter #2
Will I standard dextron/mercon by castrol or valvoline work for what i need?
 

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never heard anything bad about amsoil.
 

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Discussion Starter #4
sweet thanks I dont know where I can get amsoil I am going to look into it in the morning my dp and valve body are here so i am dyein to get them in.
 

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I use Amsoil and just putting that in picked up 1 mpg
 

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Why pay $$$$$$$ for AMSOIL???? The only approved oil for the 4R100 has always been Dextron/MerconIII , only recently has Ford all of a sudden said it is okay to run MerconV, even though it strictly warns against this in your owners manual. Ford has been asked by thousands of us why it is now okay to run this Mercon V and no response. Some want to tell you the Mercon V has been reformulated to work in the 4R100, this is a bold face lie. Many have researched this and no reformulation has ever took place. Think about it, how many 4R100's are still under warranty? Not many, the Mercon V isn't going to kill your trans overnight, it will take quite awhile to ruin the seals in the trans, buy this time all warranties will be expired and Ford can make a fortune rebuilding tranny's. Think they won't do that? Look at how much they charged for a CPS for many, many years. Mercon III/Dextron hasn't been made since June of 07, once the supply is gone it's gone. Could be a year, could be 5 I don't know. I bought 4 cases and since I only put 12K per year on my truck it should last me awhile. The only time I recommend synthetics is if you are towing heavy, alot and see tranny temps above 200-210 on a reg basis, if you don't use your truck this way and see these temps reg old Dino oil will do just fine. Dino oils have come a long way, so don't fall for all the hype on synthetics, especially the claim they lower tranny temps. I fell for that one and proved it is false!! Synthetics are good for certain conditions, but the average PSD owner doesn't need them.
NCH
 

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I used castrol. Job is messy if you dont prep your work area, so plan accordingly.
 

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Discussion Starter #8
I got my fluid in and everythnig back together I just cant decide how much to put in after i drained the tc and put in that new valve body any help?
 

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Powerstroke Junkie
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You have a dipstick for the trans right? Add fluid until it lands near the top of the lines on the dipstick. I would add a couple quarts and check it. You have almost 5 gallons of trans fluid being a 2-3 quarts low isn't going to explode your trans. Make sure you look at the right place on the dipstick for cold or hot engine and it should be running.
NCH
 

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Discussion Starter #10
Yea i got it thanks for all the help. seems like a new truck.
 
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