It would be my opinion to go with the factory recommendation in an automatic transmission, as some have specific needs, that possibly hytran would not best be suited.
on the reverse, ATF is specified as an alternative by Sundstrand.
The fact that hytran absorbs moisture might not be a good thing in an automatic where an emulsion of water/oil
would cause a problem, but I'm no oil expert.
At the cost of hytran, I would think mercon or Dextron would be economically a better choice.
Replacing a automatic is a costly experiment compared to a used hydro for maybe $100.
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