| Re: [GMCnet] Radiator Oil & Transmission Cooler Connections [message #325724 is a reply to message #325723] |
Fri, 03 November 2017 23:07   |
Kosier
Messages: 834
Registered: February 2008
Karma:
|
Senior Member |
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Ken,
I think you'll find those fittings in the transmission are 1/4" straight
pipe thread.
The reason for the odd sized fitting at the radiator cooler is because GM
used
3/8" cooler lines up through 1972. When they dropped to 5/16", it was easy
enough to use the correct fittings at the transmission, but it would have
cost
money to retool the cooler in the radiator. And, of course, if it turned
out that
they had made a mistake, it would have cost even more to go back. Funny!
Gary Kosier
77PB w/500Cad
Newark, Ohio
--------------------------------------------------
From: "Ken Henderson"
Sent: Friday, November 03, 2017 8:43 PM
To: "GMC Mail List"
Subject: Re: [GMCnet] Radiator Oil & Transmission Cooler Connections
> Rob,
>
> IIRC, the OEM transmission line is 5/16", but, as Jim K says, with a weird
> nut at the cooler -- because the cooler fitting is 3/8". That's what
> allows us to replace the OEM 5/16" lines with 3/8" by changing the fitting
> at the transmission from 5/16" inverted flare x 3/8' straight thread to
> 3/8" inverted flare x 3/8" straight thread
>
> Manny delivers the unusual 3/8" inverted flare x 3/8" straight thread
> adapter with his TH425 rebuilds.
>
> Ken H.
>
>
> On Fri, Nov 3, 2017 at 3:36 PM, Rob Mueller
> wrote:
>
>> G'day,
>>
>> I want to double check the connections to the oil and transmission
>> coolers
>> in the radiator, IIRC the oil cooler is 1/2 inch inverted
>> flare and the transmission cooler is 3/8 inch inverted flare or is it
>> 5/16
>> inch inverted flare?
>>
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