Re: [Chrysler300] Dexron vs. type F and the real issue which is that LETTER CAR transmissions are different and are high performance

[Bill Huff <czbill@xxxxxxxxxx>]

I firmly believe that the way the car is driven may enter into the 
longevity and the need for Type F.  The 300 transmissions were 
modified to meet the increased HP of the engines and the presumed 
harder usage of the cars.  If you drive like granny and the engine 
never sees more than 3000 RPM, probably any compatible fluid would 
do.  If you like acceleration and leaving black marks on the 
pavement, then I think the path is clear that type F is the recommended fluid.

Bill Huff



At 5/17/201212:48 AM, Michael Moore wrote:
>I appreciate the discussion, although I am more confused than ever!
>Mike Moore
>300H
>
>(I put nearly 300,000 miles on my H without ever changing the fluid 
>(dealership said not to) nor did I ever have any trouble with it. I 
>had it and the engine rebuilt at 280,000 miles. I have owned the car 
>since 1965. I used dexron the dexron 5 now and it has 340,000 miles on it.
>Mike Moore
>
>
>
>On May 16, 2012, at 9:40 PM, C Bilter wrote:
>
>Greetings-
>
>Yes, this subject is getting tired, but instead of deleting or moaning you
>may actually want to read this as this relates to letter cars which, after
>all, is the real reason for the listserver, and it wasn't clear to me that
>the latest thread actually ever got focused on letter cars.
>
>I am no transmission expert, but George Riehl is (or was) and he wrote an
>excellent article for the NewsFlite about 10 or 15 years ago on letter car
>transmissions.
>
>For those newer to the club, here is what George had to say about letter car
>transmissions:
>
>1) "There were many internal differences for the 300 (letter car)
>transmissions and it gets very involved. Front and rear clutch packs have
>more friction discs. Front cushion spring is eliminated, kick down lever is
>of a different ratio, rear clutch spring is different, accumulator spring is
>eliminated, line pressures are higher, clutch pack clearances are closer,
>band adjustments are tighter and governor weights and springs are
>different."
>
>2) "The fluid to use in these transmissions (letter cars) is type F or
>FA. I prefer type F when available. Type "A" suffix "A" should not be used
>and is fortunately not readily available. Do not use Mercon or Dexron, as
>they will result in early transmission failure. Chrysler put out a special
>tech bulletin to technicians to use Type F, even in the A833 4-speed
>transmissions."
>
>It would be interesting if someone could dig up that tech bulletin and see
>exactly when it was issued and to what transmissions it applies to.
>
>Of note, after Dexron was introduced Chrysler began using it as the factory
>transmission fill for both TorqueFlite and the A-833 4-speed. From the 1975
>chassis service manual, page 0-27: "Use only fluids of the type labeled
>DEXRON Automatic Transmission Fluid such as MOPAR DEXRON Automatic
>Transmission Fluid, Part Number 3549660, or equivalent."
>
>Of course, this was long after letter cars and their modified high
>performance transmissions. I assume, therefore, the real need for type F is
>both for firm shifts and the so the modified higher performance letter car
>transmissions do not fail prematurely.
>
>Carl Bilter
>
>[Non-text portions of this message have been removed]
>
>
>
>
>
>[Non-text portions of this message have been removed]
>
>
>
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