Originally Posted by R1jake
Originally Posted by dave1251
Originally Posted by T-Stick
So I have the Ford 4R100 in a 7.3 powerstroke. I don't think it works best on a lighter viscosity fluid either. Use a Mercon of your choice such as Chevron MD3, Valvoline/Castrol Dex/Merc etc. Then include Redline D4 in a 1/3 ratio mix. Redline will help get you some modern friction modifiers and the viscosity will be heavy at the factory spec. This is hands down the best formula that I have used in the 4R100 after playing with some different brews. Mercon V will tend to cause more slippage over time. Straight Mercon would get me some delayed hang shifts while the 1/3 ratio addition of Redline D4 to the Mercon eliminated those, and now I get a firm shift at the right rpm.
MERCON is not a heavy fluid after use it's thinner than MERCON LV.
MERCON
https://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=706440
After 13000 miles it's CST is 43.
The longer in use it will drop further
MERCON LV
https://www.bobistheoilguy.com/foru...tthread/Board/47/main/289915/type/thread
After 14000 miles it's CST is 46.
After use it will retain its grade remarkably better than DEXRON/MERCON III.
OP if you want a "thicker" fluid virtually everything on the self is thicker than MERCON.
This is the first I've heard mercon LV, for the E4OD ford specified regular mercon and said not to use anything else then when mercon was dropped they then said to use mercon V which was originally not ok. This all has me very confused what to get. Now hearing mercon LV I've not heard anyone say to use this in the E4OD??
I am totally lost on what is best to use for my transmission and the more I research it the more lost I get. Lol what's the difference between mercon V and mercon LV ??
I do know regular mercon is what was called for for the E4OD so I would love to be able to get it but it's no longer Available. Thanks In advance for any advice.
Maybe this helps.
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.aa1car.com/library/ford_tsb_06144.pdf&ved=2ahUKEwjNtPjEjPXlAhVFqJ4KHfm0AGQQFjAJegQIAhAB&usg=AOvVaw3IR-XGVzBZmrKClLDLPE2A
I'm not saying use MERCON LV over MERCON V but the false narrative of LV ATF being thinner than legacy DEXRON/MERCON III is just false and silly.