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#1 |
Registered User
Join Date: May 2004
Location: Ontario Canada
Posts: 164
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Replacing Transmission cooler lines
I need to replace the cooler lines in my 68 C10 SB. I'd like to use something easy to bend and corrosion resistant. Most of the steel and Cupro Nickel line I've looked at is .028" wall thickness. I've replaced the cooler lines in my 06 Silverado with factory replacement lines and they seem a lot lighter. I know they're steel because the old ones where rotten rusty. I don't drive the 68 in winter weather so not too concerned about them rusting out. What is everyone using?
Thanks |
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#2 |
Registered User
Join Date: Oct 2015
Location: IN
Posts: 209
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Re: Replacing Transmission cooler lines
Just did this on my truck. I used 5/16" nickel-copper tubing and Inverted Flare, 5/16 in. Tube, 1/2-20 in. Stainless Steel Nuts.
I found the stainless steel tube nuts at Summit Racing and the nickel-copper tubing from O'reilly, but you can get the tubing from a lot of different places. Make sure it says nickel and copper, not just copper. |
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#3 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,397
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Re: Replacing Transmission cooler lines
Any parts store should have the b-nuts, and roboticjunky is right about the NiCop line. Straight copper will work harden and crack, probably at the worst time. Steel doesn't work harden in your lifetime, and it's cheap, which is why the general ran it.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#4 | ||
Registered User
Join Date: May 2004
Location: Ontario Canada
Posts: 164
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Re: Replacing Transmission cooler lines
Quote:
Quote:
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#5 |
Registered User
Join Date: Oct 2015
Location: IN
Posts: 209
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Re: Replacing Transmission cooler lines
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#6 |
Registered User
Join Date: May 2004
Location: Ontario Canada
Posts: 164
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Re: Replacing Transmission cooler lines
I understand! One of the fitting threads in my rad is stripped so I installed an external cooler. The plan was to pull the rad to fix it but decided to use just the external cooler. I was thinking to run 3/8 line to it and use two inches of rubber to connect the cooler for each line. It has 5/16 copper (previous owner) line on it now and I thought it was too small and restrictive and want to get rid of the copper anyway. I didn't have any cooling issues with the 5/16" line though?
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#7 |
Registered User
Join Date: Jan 2019
Location: St Peters, MO
Posts: 439
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Re: Replacing Transmission cooler lines
I used Right Stuff pre-bent lines from Summit (P/N RSD-TTC6803). They went on with minor tweaking. They're $45, but saved time and frustration, for me anyway.
__________________
1967 C20, 350 SBC w/Comp roller cam, 700R4 w/3.42 posi, PS, 4-wheel PDB, Old Air AC & GM Tilt column. Last edited by tim_mc; 01-30-2021 at 06:50 PM. |
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#8 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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I cut lines of out of the transmission. Used double flare tool made dimples on them. Put rubber hoses on them ran to radiator used correct fittings with barbs on them to attach to radiator. Simple easy and the hose will route a lot better than tubing. Over 5 years never touched it yet.
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__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#9 |
Senior Member
![]() Join Date: Mar 2015
Location: washington
Posts: 2,243
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Re: Replacing Transmission cooler lines
Factory lines are 5/16"
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#10 |
Registered User
Join Date: May 2004
Location: Ontario Canada
Posts: 164
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Re: Replacing Transmission cooler lines
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#11 | |
Registered User
Join Date: Sep 2016
Location: Tulsa, OK
Posts: 415
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Re: Replacing Transmission cooler lines
Quote:
I'm slowly working on swapping an LS into my truck and will eventually have to look into it.
__________________
1971 C10 - Hugger Orange/White My Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=780197 LS Swap Thread: https://67-72chevytrucks.com/vboard/...d.php?t=811460 |
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#12 | |
Registered User
Join Date: May 2004
Location: Ontario Canada
Posts: 164
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Re: Replacing Transmission cooler lines
Quote:
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#13 |
Registered User
Join Date: Apr 2009
Location: PNW
Posts: 553
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Re: Replacing Transmission cooler lines
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#14 |
Senior Member
![]() Join Date: Mar 2015
Location: washington
Posts: 2,243
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Re: Replacing Transmission cooler lines
I should have qualified it. The 68 C10 SB lines were 5/16.
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#15 |
Registered User
Join Date: May 2004
Location: Ontario Canada
Posts: 164
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Re: Replacing Transmission cooler lines
Thanks everyone for all the suggestions. I went with the 5/16". I couldn't find the fittings I needed for the 3/8" right away and needed to get it done. The copper lines I took off were 5/16" and I didn't have any issues so on to another project.
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#16 |
Registered User
Join Date: Jun 2015
Location: Carlos MN
Posts: 2,045
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Re: Replacing Transmission cooler lines
The nicop lines are rated for brake line pressures so cooler lines are no where near that. The nicop lines flare like butter and bends much easier than steel lines.
You need to keep in mind rigid lines need some flex due to engine movement. |
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#17 |
Registered User
Join Date: May 2004
Location: Ontario Canada
Posts: 164
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Re: Replacing Transmission cooler lines
The copper lines I replaced were fastened to the frame not allowing for movement. I replaced them with nicop and fastened them to the engine right up to the rad support where they change to rubber to the cooler. The nicop lines are easier to bend than steel but still pretty tough.
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