Tried search - didn't find specific help there. I know this has been discussed before; BUT, want to know the latest on what ATF to use in my original 1955 Fordomatic.  Explanations???

Thanks, JLB

55 Ford Crown Victoria Steel Top

Dexron II or III whatever the latest update is for Dextron is the replacement for Type A.   .. Type F is not suggested as the replacement for Type A. That's regarding an existing Transmission. If U are going with a rebuilt ask the Supplier what they recommend. 

  

Thanks! You just verified some of my other research earlier and elsewhere.  I consider this site the most reliable!

JLB

55 Ford Crown Victoria Steel Top

What is wrong with type "F" I've been using it in my 63 Cruse-0-matic for the last 10 years.

Dexron will absorb the heat better but F series oil has an additive that is to protect the seals and clutches! If your transmission does not need F type Oil 

Dexron is a better choice. C4 and C6 Transmissions made during the 1960's needed F type oil. Ford quit using F type oil When catalectic converters were cooking the transmission's oil.  Any modern rebuild will replace the parts necessary so the  Transmission's that needed F type can use   Dexron! 

Was Type "F" not  the recommended Fluid in 1963 for that Transmission? The replacement for A is Dexron.

  

murcon is recommended by local ford trans Teck(not the service writer).

"Ford first produced its own transmission fluid formulation in 1967, referred to as Type F or Type FA. The name comes from Ford’s specification number for the fluid, ESW M2C33-F. This fluid was used in all Ford transmissions until 1977 and most Ford transmissions until 1980."

HEMMINGS - https://www.hemmings.com/blog/2015/03/16/tech-101-automatic-transmission-fluid-part-one-american-manufacturers/

TYPE F was developed to use with asbestos material clutch discs. When asbestos was banned by the government, FORD formulated to other fluid(s).

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I bought a case of "A" on Amazon to service my 56 transmission. Replaced the Ford-O with a Cruise-O so I'll probably end up selling at a swap meet. You can still get A if you so choose.I was told to use Mercon ll in the new one..Good Luck.

56 Vic, B'Ville 200 MPH Club Member, So Cal.