Home » Public Forums » GMCnet » Transmission cooler lines
| Transmission cooler lines [message #357016] |
Mon, 20 July 2020 13:00  |
6cuda6
Messages: 975
Registered: June 2019
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Anyone know if the trans cooler lines are unique to these coaches or if they come from something else? Mine are a bit suspect after a pin hole repair yesterday.....normally i'd just make my own but i'm short on time before our major trip so if i can find something pre-made off another GM product it would simplify things greatly.
Yes i know JimK has some and trust me i would love to give him more of my hard earned $$$ but between the shipping cost, shipping time and dollar exchange its just not feasible at the moment.
Rich Mondor,
Brockville, ON
77 Hughes 2600
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| Re: [GMCnet] Transmission cooler lines [message #357019 is a reply to message #357017] |
Mon, 20 July 2020 13:48  |
6cuda6
Messages: 975
Registered: June 2019
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That's my plan if nothing is really available.....i've made hundreds of lines over the years for different vehicles and as you've said its not hard just takes a few hours.
GMC.LES wrote on Mon, 20 July 2020 14:25Rich,
The lines are unique to the coach. Even if there were other models that fit, finding those parts in stock here in Canada for something of this vintage will take some hunting and would most likely require shipping. Making your own lines and installing them is less than a day’s work. Get yourself the appropriate sized Poly-Armour Tubing and a bender and your halfway there.
Les Burt
Montreal
'75 Eleganza 26'
> On Jul 20, 2020, at 2:01 PM, 6cuda6--- via Gmclist wrote:
>
> Anyone know if the trans cooler lines are unique to these coaches or if they come from something else? Mine are a bit suspect after a pin hole repair
> yesterday.....normally i'd just make my own but i'm short on time before our major trip so if i can find something pre-made off another GM product it
> would simplify things greatly.
>
> Yes i know JimK has some and trust me i would love to give him more of my hard earned $$$ but between the shipping cost, shipping time and dollar
> exchange its just not feasible at the moment.
> --
> Rich Mondor,
>
> Brockville, ON
>
> 77 Hughes 2600
>
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Rich Mondor,
Brockville, ON
77 Hughes 2600
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| Re: Transmission cooler lines [message #357022 is a reply to message #357016] |
Mon, 20 July 2020 14:11 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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A couple of companies make them but they are too long to ship. So they cut them in half. They are unique to the GMC so nothing else will fit. Make your own. The are very low pressure return lines, so it is no big deal to bend and flare them.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Transmission cooler lines [message #357023 is a reply to message #357022] |
Mon, 20 July 2020 14:16 |
6cuda6
Messages: 975
Registered: June 2019
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Thanks Ken....i was more just trying to save a few hours work that i could use to other tasks on the coach seeing as how im working this week and next but if nothing else crosses over the DIY is gonna be it [plus i hate it when they bend/cut lines to ship them].
Ken Burton wrote on Mon, 20 July 2020 15:11A couple of companies make them but they are too long to ship. So they cut them in half. They are unique to the GMC so nothing else will fit. Make your own. The are very low pressure return lines, so it is no big deal to bend and flare them.
Rich Mondor,
Brockville, ON
77 Hughes 2600
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| Re: Transmission cooler lines [message #357024 is a reply to message #357016] |
Mon, 20 July 2020 14:16 |
winter
Messages: 247
Registered: September 2007
Location: MPLS MN
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Keep in mind the connections at the tranny are not tapered pipe threads. Using that will probably crack the case. I think the connections were inverted flare but don't remember for sure
Jerrod Winter
1977 Palm Beach
Green Jelly Bean
Twin Cities, Minnesota
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| Re: Transmission cooler lines [message #357026 is a reply to message #357024] |
Mon, 20 July 2020 14:18 |
6cuda6
Messages: 975
Registered: June 2019
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Thanks for the heads up....i noticed when looking at the GMC sites that they supplied flare to threaded fittings for the trans so i knew something was up
winter wrote on Mon, 20 July 2020 15:16Keep in mind the connections at the tranny are not tapered pipe threads. Using that will probably crack the case. I think the connections were inverted flare but don't remember for sure
Rich Mondor,
Brockville, ON
77 Hughes 2600
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| Re: Transmission cooler lines [message #357033 is a reply to message #357016] |
Mon, 20 July 2020 22:16 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
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What I remember is you buy tubing. Bend your own, but re-use the original old fittings on the new tubing.
You have two different size end pieces. The radiator side being an odd ball. (5/16” tube with what would be a 3/8” tube nut??
Some people think upping to 3/8” tube improves things. But that really takes some odd fittings to make work.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: [GMCnet] Transmission cooler lines [message #357035 is a reply to message #357033] |
Mon, 20 July 2020 23:17 |
stu@97381.com, Emery
Messages: 232
Registered: June 2020
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Jon—
It really doesn’t take any odd fittings to install 3/8” lines.
When I changed my lines years back to 3/8” I just bought standard 3/8” pre-flared steel brake lines. They are available in many different lengths.
I recall buying two fittings that would go into the top of my transmission. I ran lines from the transmission to the left frame rail and then joined another line to it with
a 3/8” inverted flare coupling. That is a very standard fitting, I ran a line connected to one of the frame lines behind the lower part of the radiator and they up to screw into the
transmission cooler in the radiator. I wanted to use an external transmission cooler which I mounted in front of the lower radiator. I bent another piece of brake line to go into
the other transmission cooler fitting in the radiator (the return line). This was bent to go around the side of the radiator and into the aux. cooler. Then I ran a line from the output
of the aux cooler to connect to the other line that ran along the frame rail.
So I used a total of 5 lengths of brake line, 2 fittings that went into the top of the transmission and 2 inverted flare couplers.
I bought a cheap tubing bender from Harbor Freight that worked very well with tight bends.
I did not need to do any flaring as the brake lines were already flared into new fittings.. All connections worked just fine with the 3/8” brake line fittings.
None of the fittings were odd sizes. The ones going into the transmission must be straight SAE thread fittings on one end going to an inverted flare on the other end.. DO NOT use pipe fittings which have a tapered thread. They have the
same threads per inch as the other fittings but the tapered portion could crack the casting of the aluminum transmission. Some transmissions do use the pipe thread but GM transmission do not. If you go to a radiator shop to buy
the fittings be careful as they might sell you the 3/8" tapered pipe thread fittings.
Emery Stora
77 Kingsley
Frederick, CO
> On Jul 20, 2020, at 9:16 PM, Jon Roche via Gmclist wrote:
>
> What I remember is you buy tubing. Bend your own, but re-use the original old fittings on the new tubing.
>
> You have two different size end pieces. The radiator side being an odd ball. (5/16” tube with what would be a 3/8” tube nut??
>
> Some people think upping to 3/8” tube improves things. But that really takes some odd fittings to make work.
>
>
>
> --
> Jon Roche
> 75 palm beach
> EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
> St. Cloud, MN
> http://lqqkatjon.blogspot.com/
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: Transmission cooler lines [message #357036 is a reply to message #357016] |
Tue, 21 July 2020 05:45 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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You maybe correct. I just thought I distinctly gave up on changing tranny lines after a day driving around town looking at all the auto parts stores and hardware stores, and re-used my old lines when I did my drivetrain rebuilds. Those tranny lines put me back a full day on the project.
I was thinking the fittings on tranny are smaller flare nut wrench then the radiator side. And to find the different nuts to match similar tube size was a problem.
But that was going on two years ago when I tried and failed at that.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: Transmission cooler lines [message #357043 is a reply to message #357016] |
Tue, 21 July 2020 10:19 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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I used premade lengths from Advanced - it took two of their longest, plus a short one and coupling to get to the upper cooler outletfor the transmission. Bending tool is cheap from Freight, harbor...
--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: Transmission cooler lines [message #357046 is a reply to message #357038] |
Tue, 21 July 2020 11:00 |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
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Larry i like that idea and it gets it away from the exhaust manifold as well.
Larry wrote on Tue, 21 July 2020 08:39Oh, the other thing I did is move the path of the cooler line from the driver side frame rail and across the front of the radiator, moved to over the top of the transmission bell housing to the passenger side frame rail. Then straight down to the radiator for a direct straight in fit. This then allowed me to put a coupler at the top of the transmission bell housing, so that when I needed to remove the trans, it was easier to disconnect the couplers at the top of the trans than reaching down to the trans cooler line inputs. JWID
Rich Mondor,
Brockville, ON
77 Hughes 2600
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| Re: Transmission cooler lines [message #357064 is a reply to message #357038] |
Tue, 21 July 2020 18:16 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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Thanks Larry. Turnquist suggested I should up my tranny cooler lines to 3/8”. So hoping I have better luck with fittings. I will be not reusing the radiator tranny cooler and will be installing a larger one i front of radiator.
When I tried to re-route and go to 3/8” line. I found the space on my 455 from passenger frame rail
To the exhaust header to be damn near the same distance as the stock lines were
To the drivers header. I opted to wrap the lines in an insulations shield at that
Time.
I am thinking 3/8” hardlines following the same route as stock. Then transition to AN fittings and a flexible hose right at the support off the fan shroud.
Turnquist said I need to make sure the cooler has the larger ports.
Always a project.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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