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tranny fluid question
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   Forward Look Technical Discussions -> Transmission and Rear AxleMessage format
 
Landyacht67
Posted 2021-08-18 4:01 PM (#614287)
Subject: tranny fluid question



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Location: Langley BC Canada
I know this has been covered somewhere on here before (and yes I tried the search),
what type of atf should I be putting in a 1958 Chrysler 3 speed push button. I noticed it's a bit low, and I guess I now have to go leak hunting, but until I get it on a hoist, what should I top up with. The other day when I parked it I had noticed a puddle of fluid, felt like hydraulic, but it wasn't red, or maybe I didn't register the color?
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wizard
Posted 2021-08-19 12:51 AM (#614298 - in reply to #614287)
Subject: Re: tranny fluid question



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Dexron III is what most of us use
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1960fury
Posted 2021-08-19 10:15 AM (#614305 - in reply to #614287)
Subject: Re: tranny fluid question



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Yes
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56D500boy
Posted 2021-08-19 12:37 PM (#614308 - in reply to #614287)
Subject: RE: tranny fluid question



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The Factory Service Manual for your 1958 Chrysler calls for Type A automatic transmission fluid (ATF). The power steering pump also uses Type A ATF.

REFERENCE: https://mymopar.com/service-manuals/

"Type A transmission fluid was first introduced for general motors car brands in the mid-50s. It was used for all automatic transmissions. Type A Transmission Fluid is the semi-automatic and ‘hydra Matic' fluid. All brands under the property of general motors such as Oldsmobile, Cadillac, Buick, Chevrolet, Pontiac, GMC, Ford, Mercury, Lincoln, Chrysler, Dodge, Desoto, Packard, and Studebaker used GM Type “A” transmission fluids from 1949–1958. It was used until mid-60 until it was replaced with Dexron, Mercon.

Dexron (B) WAS the first generation of automatic transmission fluids. They were produced after Type A transmission fluid in the mid-60s. When you compare type A transmission fluid vs. Dexron, we will find that Dexron (B) was composed of a more stable, less reactive, and hydrotreated base oil. It is, therefore, more resistive to heat and anti-oxidation. It was first used by GM dye red as an aid in fluid leakage detection. This fluid is compatible with all Type “A” Suffix “A”, and the Type “A” fluids produced by GM and equipped in GM vehicles.

Dexron II was the successor of the Dexron (B). It was developed by GM in the 70s, for better viscosity control and additional oxidation inhibitors. It was also the first GM transmission fluid for electronic transmissions.

Dexron III was used as a torque converter and to replace Dexron 2. This generation was considered the most successful. It had improved oxidation and corrosion control. Before the year, 2000 80 percent of transmission fluid was covered by general motors Dexron 3."

REFERENCE: https://rxmechanic.com/type-a-transmission-fluid/





Edited by 56D500boy 2021-08-19 1:29 PM
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Landyacht67
Posted 2021-08-21 10:37 PM (#614368 - in reply to #614287)
Subject: Re: tranny fluid question



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Posts: 40
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Location: Langley BC Canada
awesome, thanks everyone. I'd seen about Dexron III superseding type "a", but a lot of times they're quick to say it's backwards compatible when really it isn't, and can kill seals etc. Just wanted to be sure.

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Powerflite
Posted 2021-08-22 1:33 AM (#614373 - in reply to #614287)
Subject: Re: tranny fluid question



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If your trans has original clutches in it, it is best to use Type F. That will work the best with the original material. If you have rebuilt the trans and replaced the clutches in it, then Dextron will work well.
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