I'm not sure what shop manual you have, but my 1955 2nd calls for the transmission to have SAE 90 straight mineral oil...see attached picture.

This is what Tractor Supply sells as FORD Tractor Transmission Fluid.

https://www.tractorsupply.com/tsc/p...-all-mineral-90-transmission-fluid-2-gal

Mike B smile
Attachments
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Mike Boteler

1956 Chevy 3100 Resto Rod
1952 Willys M38 Army Jeep
1983 Jeep CJ7 Laredo
1984 Jeep CJ7
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Silver Spring, MD