Don’s advice shall supersede anything I write here. I own one each of all the popular mid-century automatic transmissions. Many of these initially specified type A or F. The original fluid formulations some of which contained whale oil were specified given the original composition of the clutch disk facings and other design attributes of a specific unit when new. Today the conventional wisdom is that all of these units have since been rebuilt once with replacement parts not identical in composition to original parts. We know, for example, that there is no asbestos in new clutch facings. Some fluid types have more “bite” than others and it mattered back in the day evidently.
I believe that is why automatic transmission experts like Don say that Dexron III is fine for any of them. Synthetic versions will work too, but are expensive and bring nothing to the party.
From: chrysler-300-club-international@xxxxxxxxxxxxxxxx [mailto:chrysler-300-club-international@xxxxxxxxxxxxxxxx] On Behalf Of D.C. Mason
Sent: Thursday, January 20, 2022 9:06 AM
To: Nick Taylor <nicksgaragesd@xxxxxxxxx>
Cc: Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: Re: {Chrysler 300} Transmission fluid recommendation for cast iron torqueflite
Have also heard that DexVI is better in the later TF (62-65?) than Dex/Merc III. Not sure why, maybe Don knows if true…
I believe Type F replaced Type A.
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