Transmission lines
TECH Resident
Joined: Apr 2014
Posts: 985
Likes: 12
Hey Slogo,
Do you have a link to the type of fittings I would need to fit into the 4L60E that would allow me to use a regular flare for a 3/8" brake line? Also, according to Griffin website, the fitting on the Radiator are 1/4" NPT. I'm not sure what type of fitting I would have to connect to these in order to run a standard parts store 3/8" line and use be able to use the standard flaring tool I would rent from the parts house. I don't own any other flaring tools so all the lines I'm going to make will have to be done with the rent-a-tool.
Thanks,
Brandon
Do you have a link to the type of fittings I would need to fit into the 4L60E that would allow me to use a regular flare for a 3/8" brake line? Also, according to Griffin website, the fitting on the Radiator are 1/4" NPT. I'm not sure what type of fitting I would have to connect to these in order to run a standard parts store 3/8" line and use be able to use the standard flaring tool I would rent from the parts house. I don't own any other flaring tools so all the lines I'm going to make will have to be done with the rent-a-tool.
Thanks,
Brandon
I did not have to flare anything. Check these out but make sure the fitting size 2 is correct for the fittings on the lines. https://www.summitracing.com/parts/r...yABEgKRsPD_BwE
I'm going to order the copper nickel line.
For the fittings I'm confused. Brake lines use inverted flare fittings. I'm reading that the stock lines for the 4l60e are 3/8, so I'd think finding fittings in 3/8 would be easy, but I'm having a hard time finding any 3/8 inverted flare fittings. Most are 1/2 or 3/16. Am I missing something?
My radiator has 1/4 NPT fittings: (fitting I need) = 1/4 NPT male to 3/8 inverted flare female.
4L60E transmission has 1/4 NPS fittings: (fitting I need) = 1/4 NPS male to 3/8 inverted flare female.
Am I correct here? Then the line would run standard 3/8 inverted flare nuts. The fact that the 3/8 size fittings are harder to find it's making me think I have something incorrect. Why do I keep seeing 3/16 so often?
Brandon
For the fittings I'm confused. Brake lines use inverted flare fittings. I'm reading that the stock lines for the 4l60e are 3/8, so I'd think finding fittings in 3/8 would be easy, but I'm having a hard time finding any 3/8 inverted flare fittings. Most are 1/2 or 3/16. Am I missing something?
My radiator has 1/4 NPT fittings: (fitting I need) = 1/4 NPT male to 3/8 inverted flare female.
4L60E transmission has 1/4 NPS fittings: (fitting I need) = 1/4 NPS male to 3/8 inverted flare female.
Am I correct here? Then the line would run standard 3/8 inverted flare nuts. The fact that the 3/8 size fittings are harder to find it's making me think I have something incorrect. Why do I keep seeing 3/16 so often?
Brandon
You see 1/4 and 3/16 because those are the two most common brake line sizes. You can buy these at any auto parts store, just ask for 3/8 flare nuts. https://www.fastenal.com/products/details/440248-131280
I'm having trouble finding the 1/4 NPS fitting to 3/8 inverted flare. I can find all the other sizes, but not 1/4 to 3/8. I can find the NPT fitting on McMaster Carr for the radiator, but I can't find the NPS fitting anywhere. Even Fastenall couldn't get them. I'd think these would be a common fitting since these transmission have 1/4 NPS fittings in them and people use 3/8" for transmission lines.
Teching In
Joined: Jun 2016
Posts: 48
Likes: 6
From: Central MN
For 3/8 tubing I believe you would want 5/8-18 inverted flare fittings.
https://www.summitracing.com/search/...7%2B4294863155
https://www.summitracing.com/search/...7%2B4294863155
Last edited by blackhawkMC; Aug 17, 2018 at 12:21 PM.
For 3/8 tubing I believe you would want 5/8-18 inverted flare fittings.
https://www.summitracing.com/search/...7%2B4294863155
https://www.summitracing.com/search/...7%2B4294863155
That would make sense since I've been unable to find the 3/8 anywhere, and for something this common I can't believe that no suppliers offer them. Why does a 3/8 cooler line use a 5/8 fitting?
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This was really confusing for me, I suppose because it's all new and I'm not familiar with the sizings. OK, from taking what you guys have told me and looking it up, I'm going to spell it out in case someone else needs the info: 3/8" tubing (transmission line) takes a 5/8 - 18 Inverted flare nut. I was about to order it all and realized one last question:
If my radiator is aluminum, what type of metal should I get for the fittings? Most of the fittings are brass, but my understanding is that brass and aluminum are not friends.
Brandon
If my radiator is aluminum, what type of metal should I get for the fittings? Most of the fittings are brass, but my understanding is that brass and aluminum are not friends.
Brandon
Really? I had no idea about that. That's awesome. I don't need it for this application as I won't be towing, but I put a 700R4 behind a 1971 Pontiac Grand Safari station wagon that I built for my wife (and she subsequently totaled and now I'm going to have to rebuild). I put on a class III receiver hitch and we plan on towing with it. It has a 455 and air shocks, so in Blues-Brothers'-Fashion, it should be ready to hit it once I get the new dog house back on.