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Old 09-16-2019, 10:11 AM   #15
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Join Date: Nov 2012
Location: Wichita KS
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Default Re: Early Ford/Mercury automatic transmissions 51'-55'

Sounds like there is still some confusion on why you use one specific transmission fluid vs another. To a large extent it depends on what is IN the transmission more than which transmission it is. Rotorwench covered this in a previous post (#4). When a transmission is rebuilt internal components get changed and depending on what these new components are fluid requirements can change. One of the major functions of transmission fluid is to work with the friction plates and bands. The fluid used needs to match the materials these components are made from. Also, if I was going to change fluids, I would flush the system first.
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