Ferret Transmission fluid.
Hello Arlon,
Just to be clear, you mean the transmision and not the fluid coupling.
For the fluid coupling I have used 20 weight tramission fluid.
If oil seals are involved then it is best to try to stay with whatever fluid was previouslt used. Times change and so do fluid requirements; for instance the M135 GMC Hydra-Matic transmission originally specified non-detergent motor oil (1951 and olderer technology) but later on the when putting fresh fluild in a newly rebuilt transmission they went to Dexron automatic transmission fluid.
...... Brian
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