| Trans fitting for 3/8"oil cooler lines [message #303523] |
Wed, 13 July 2016 14:40  |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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We are getting ready to reinstall the rebuilt trans. We will be converting the 5/16" stock cooler lines to 3/8" lines. Does anyone have the part # for the fitting that goes into the transmission that allows us to use the 3/8" lines? The female hole in the trans is NOT NPT, but rather a straight thread with a washer under the shoulder of the fitting. I looked on Gene's GMC Motorhome site and did a search on this forum site and did not find what I'm looking for.
Also need to be reminded of which of the two lines is the feed and which is return to the transmission.
Thanks in advance.
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] Trans fitting for 3/8"oil cooler lines [message #303525 is a reply to message #303523] |
Wed, 13 July 2016 14:48  |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Larry,
there was a source, but they no longer make it, so now I redo one for our
kit.
Call me and I'll supply them to you n/c as you and Lucy do so much for the
International.
On Wed, Jul 13, 2016 at 12:40 PM, Larry wrote:
> We are getting ready to reinstall the rebuilt trans. We will be converting
> the 5/16" stock cooler lines to 3/8" lines. Does anyone have the part #
> for the fitting that goes into the transmission that allows us to use the
> 3/8" lines? The female hole in the trans is NOT NPT, but rather a straight
> thread with a washer under the shoulder of the fitting. I looked on
> Gene's GMC Motorhome site and did a search on this forum site and did not
> find
> what I'm looking for.
>
> Also need to be reminded of which of the two lines is the feed and which
> is return to the transmission.
>
> Thanks in advance.
>
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: Trans fitting for 3/8"oil cooler lines [message #303540 is a reply to message #303523] |
Wed, 13 July 2016 18:37 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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Larry, the inside tranny line is the feed and goes to the bottom port on the radiator. It returns out the top to the outside of the tranny. The engine oil cooler lines feed the top and returns out the bottom.
Larry wrote on Wed, 13 July 2016 15:40We are getting ready to reinstall the rebuilt trans. We will be converting the 5/16" stock cooler lines to 3/8" lines. Does anyone have the part # for the fitting that goes into the transmission that allows us to use the 3/8" lines? The female hole in the trans is NOT NPT, but rather a straight thread with a washer under the shoulder of the fitting. I looked on Gene's GMC Motorhome site and did a search on this forum site and did not find what I'm looking for.
Also need to be reminded of which of the two lines is the feed and which is return to the transmission.
Thanks in advance.
C. Boyd
76 Crestmont
East Tennessee
[Updated on: Wed, 13 July 2016 18:38] Report message to a moderator |
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| Re: Trans fitting for 3/8"oil cooler lines [message #303542 is a reply to message #303540] |
Wed, 13 July 2016 18:39 |
C Boyd
Messages: 2629
Registered: April 2006
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Edited
C Boyd wrote on Wed, 13 July 2016 19:37Larry, the inside tranny line is the feed and goes to the bottom port on the radiator. It returns out the top to the outside of the tranny. The engine oil cooler lines feed the top and returns out the bottom.
Larry wrote on Wed, 13 July 2016 15:40We are getting ready to reinstall the rebuilt trans. We will be converting the 5/16" stock cooler lines to 3/8" lines. Does anyone have the part # for the fitting that goes into the transmission that allows us to use the 3/8" lines? The female hole in the trans is NOT NPT, but rather a straight thread with a washer under the shoulder of the fitting. I looked on Gene's GMC Motorhome site and did a search on this forum site and did not find what I'm looking for.
Also need to be reminded of which of the two lines is the feed and which is return to the transmission.
Thanks in advance.
C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] Trans fitting for 3/8"oil cooler lines [message #303621 is a reply to message #303523] |
Fri, 15 July 2016 03:44 |
Ericm
Messages: 2
Registered: April 2016
Location: Southern California
Karma: 0
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Junior Member |
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Hi
Is this relevant? I found it in the GMC faq:
http://bdub.net/gmc-faq.html
How can I use 3/8" tubing from the transmission to the cooler?
> There was some discussion on the GMCNET about changing the tranny cooler
> lines from 5/16 to 3/8 size. The problem is getting the fitting that screws
> into the tranny housing that will accept the 3/8 line. Some of the Eldo's
> had the tranny fitting that would take the 3/8 line, as Manny has pointed
> out.
> Edelmann makes an adapter that screws into the OEM 5/16 fitting of the
> tranny that converts it to a 3/8 inverted flare so that it will accept the
> 3/8 steel line. The Edelmann adapter is #258650. These can be purchased at
> Carquest and several other suppliers. The 3/8 line will give somewhat of an
> increased flow to the cooler and have less restriction than the 5/16 line.
> The radiator tank will take the 3/8 line, just remove the 5/16 reducing
> adapter.
> Bob Drewes (8-08-02)
More description on the fitting here:
http://www.plews-edelmann.com/assets/1/7/AutomotiveFittings_90078.pdf
Availability:
https://www.summitracing.com/parts/edd-258340
http://www.oreillyauto.com/site/c/detail/EDE0/258650/N1415.oap?pt=N1415&ppt=C0267
Eric
On Wed, Jul 13, 2016 at 12:40 PM, Larry wrote:
> We are getting ready to reinstall the rebuilt trans. We will be converting
> the 5/16" stock cooler lines to 3/8" lines. Does anyone have the part #
> for the fitting that goes into the transmission that allows us to use the
> 3/8" lines? The female hole in the trans is NOT NPT, but rather a straight
> thread with a washer under the shoulder of the fitting. I looked on
> Gene's GMC Motorhome site and did a search on this forum site and did not
> find
> what I'm looking for.
>
> Also need to be reminded of which of the two lines is the feed and which
> is return to the transmission.
>
> Thanks in advance.
>
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: Trans fitting for 3/8"oil cooler lines [message #303622 is a reply to message #303523] |
Fri, 15 July 2016 08:37 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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What determines which way the flow goes in the coolers? Or, does it matter?
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Trans fitting for 3/8"oil cooler lines [message #303625 is a reply to message #303610] |
Fri, 15 July 2016 09:53 |
Kosier
Messages: 834
Registered: February 2008
Karma: 1
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Senior Member |
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Emery,
I remanufactured some standard 1/4" pipe adapters to
1/4" straight pipe thread. You also need to put a little
undercut at the bottom of the thread to give a flat seat
for the sealing washer.
GM actually used 3/8" cooler lines up to 1972, but trying
to find those fittings is almost impossible at this time.
Gary Kosier
77PB w/500Cad
Newark, Ohio
--------------------------------------------------
From: "Emery Stora"
Sent: Thursday, July 14, 2016 7:41 PM
To:
Subject: Re: [GMCnet] Trans fitting for 3/8"oil cooler lines
>
>> On Jul 14, 2016, at 6:06 AM, Espen Heitmann wrote:
>>
>> The treads in the case is 1/4NPSM :)
>> —
> Espen is correct on this.
>
> A word of caution about the 3/8" fittings that go into the transmission.
> Our transmissions used a straight thread on the fitting 1/4 National Pipe
> Straight Mechanical. NOT a tapered pipe fitting (NPT) Many transmissions
> in later year GM transmissions do use the tapered pipe thread. It is the
> same 18 threads per inch and will tread into our transmission but it could
> crack the aluminum casting of the GMC transmission when tightened. Our
> straight thread fitting uses a copper washer to seal against the
> transmission case. Tapered fittings seal with the threads squeezed
> together.
>
> If you are replacing the transmission cooler lines with a 3/8" line note
> that it has 2.25 times more cross section than a 1/4" line. It has 4
> times the cross section of a 3/16" line. So it will give a lot more flow
> and much less restriction to flow.
>
> Emery Stora
> 77 Kingsley
> Frederick, CO
>
>
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| Re: [GMCnet] Trans fitting for 3/8"oil cooler lines [message #303747 is a reply to message #303622] |
Mon, 18 July 2016 08:32 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Johnny,
Look at MM X7525, page 7-25, Fig 13 and it show the flow path for the transmission oil cooler.
The transmission outlet is the one closest to the engine and goes to the radiator to the top fitting on the radiator and out the bottom fitting of the radiator. and returns to the transmission on the outside of the transmission housing.
JR Wright
78 Buskirk Stretch
75 Avion
Michigan
> On Jul 15, 2016, at 9:37 AM, Johnny Bridges via Gmclist wrote:
>
> What determines which way the flow goes in the coolers? Or, does it matter?
>
> --johnny
> --
> '76 23' transmode Norris upfit, 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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