Re: {Chrysler 300} Transmission fluid recommendation for cast iron torqu

Dan,

You are right that most transmissions this age have been rebuilt at least once. However, the bands in the old iron Tf were pretty rugged, and I prefer to re-use them if still in good shape. The only time I change them is if they are severely worn or water has gotten into the trans. Some of the re-lined bands I have seen don't fit the drum well either. I also have a good supply of good used friction plates that I would not hesitate to use on something for myself. My customer rebuilds get new ones, but there is a developing problem with getting the correct thickness on the plates. The front clutch calls for .062 plates, but they are now coming in at .068 at times. That doesn't seem like much, but the front clutch clearance is only .020-.040. You can see where they could stack up solid if not careful.

The trans in my 59 E has dex III in it and will catch hard second gear rubber at full throttle. There is really no advantage to spending more for dex VI.

Don

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.

V/r,

dave

Sent from my iPhone

On Jan 20, 2022, at 12:53 AM, Nick Taylor <nicksgaragesd@xxxxxxxxx> wrote:

For my 1960 the service information says to use Type A but George Riehl's 2002 article says to use Type F. What is the current recommendation?

Also, would that be the same for a 1957?

Thanks, Nick

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