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Investigation of a 56 Era Mopar Transmission Cooler
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56D500boy
Posted 2020-04-14 12:14 PM (#596825)
Subject: Investigation of a 56 Era Mopar Transmission Cooler



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While I was developing the parts I needed for swapping my 56 Dodge Powerflite for a 57(ish) Torqueflite, I discovered the existence of a Powerflite/Torqueflite transmission cooler that was separate from a radiator-based transmission cooler. The cooler in question basically is a heat exchanger that has the tranmission coolant lines running into and out of it while at the same time the exchanger body becomes basically one of the hoses between the water pump and the radiator. By 1957-58, Mopar eliminated this piece in favour of a heat exchanger section in the radiator.

This was the first I learned of this cooler (the item pointed at as being in Part Section 9-46-31)



Here is an example on a 56 Desoto Adventurer (not sure if it was Powerflite or Torqueflite) (most likely a Powerflite)



It appears that there were two different parts, 1403 984 for the 55-56 (and maybe 54 ?) Desotos and 1558 385 for the 55-56 Chryslers (see below). Apparently, while some Chryslers and Desotos had liquid-cooled Powerflites (and late 56 Chrysler Torqueflites (??)), no Dodges or Plymouths had them. They just had air-cooled Powerflites in 1955-56.

Sometime ago, I bought a used cooler to investigate what was going on inside but never had (or made) the time to document what I found. With the Covid-19 "Stay the Fk At Home" (STFAH) program, I actually started cleaning up my area of the basement and found the cooler in the eBay box again yesterday. So I took some photos. (see below):

It appears that after the external inlet fitting, the hot transmission fluid flow is split into two hollow flat tubes (crimped) to provide the surface area for the liquid to liquid heat exchange. Those flat tubes go to the exit/return fitting and are joined together at the fitting. At least that is what I can see.



Edited by 56D500boy 2020-04-14 5:34 PM




(56EraTransmissionCooler_PartNos.jpg)



(56EraTransmissionCooler_1.jpg)



(56EraTransmissionCooler_2.jpg)



(56EraTransmissionCooler_4.jpg)



(56EraTransmissionCooler_3.jpg)



(56EraTransmissionCooler_5.jpg)



Attachments
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Attachments 56EraTransmissionCooler_PartNos.jpg (207KB - 19 downloads)
Attachments 56EraTransmissionCooler_1.jpg (90KB - 19 downloads)
Attachments 56EraTransmissionCooler_2.jpg (83KB - 19 downloads)
Attachments 56EraTransmissionCooler_4.jpg (101KB - 18 downloads)
Attachments 56EraTransmissionCooler_3.jpg (81KB - 18 downloads)
Attachments 56EraTransmissionCooler_5.jpg (106KB - 19 downloads)
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StillOutThere
Posted 2020-04-14 8:41 PM (#596850 - in reply to #596825)
Subject: Re: Investigation of a 56 Era Mopar Transmission Cooler



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When the '57s came along (and thereafter) the transmission heat exchange cooling was done in the bottom tank of the radiator. One tank fitting in and another out. The engineers were looking to achieve as optimal a running temperature as possible for longevity. The earliest '57 radiators for water cooled Torqueflites had a cooling element that was too short and it stayed too warm. Then one went into production that was too long and it got too cool. A third cooler in the bottom tank was an in-between size and that radiator part number for big DeSotos, Chryslers and Imperials, continued in production. They are all in the '57 parts books as each superseded the previous.
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