Transmission lines 4L60e to stock 71 rad cooler
 

Help, I have looked and read lots on this topic and the more I search the more conflicting answers come up.
Can I ask this question one more time?
Looking for the fitting size and tread type form a 4L60e to stock 71 radiator transmission cooler.
I will be running a hose replacement.
Thanks so much!

Re: Transmission lines 4L60e to stock 71 rad cooler
 

You'll want 1/4" NPS fittings at the trans.

Re: Transmission lines 4L60e to stock 71 rad cooler
 

Ok, Thank You!
Now what size is need to the stock 1971 GMC rad cooler,and hose size recommended.

Re: Transmission lines 4L60e to stock 71 rad cooler
 

I can't help you there. I've yet to own a '67-72.

Re: Transmission lines 4L60e to stock 71 rad cooler
 

I'm sure someone will remember,
I know this has been asked many times!

Re: Transmission lines 4L60e to stock 71 rad cooler
 

The original tube is 5/16". Regular tube nuts with a double flare on the tubing should go in both the factory trans. fitting (the "adapter" fitting that racecouger mentioned) & your radiator.

You will want to use either metal tube or braided hose with correct ends...regular rubber hose & clamps is NOT the way to go.
Lorne

Re: Transmission lines 4L60e to stock 71 rad cooler
 

So a 5/16 male inverted flare fitting is what I need?

Re: Transmission lines 4L60e to stock 71 rad cooler
 

I used these fittings with the stock 4l60e lines.

http://i1123.photobucket.com/albums/...D34269975F.jpg

http://i1123.photobucket.com/albums/...F79D309122.jpg

Re: Transmission lines 4L60e to stock 71 rad cooler
 

So you're saying you used the lines from the donor vehicle with the stock radiator?

Re: Transmission lines 4L60e to stock 71 rad cooler
 

Yes, that is correct. The fittings screw into the stock radiator and the donor lines push right into the fittings with the clips. The lines required a few bends but everything turned out great.

Re: Transmission lines 4L60e to stock 71 rad cooler
 

I've been trying to figure out the same thing! i just got my 5.3l/4l60e dropped in this past weekend. Great info uxdesigner.

Re: Transmission lines 4L60e to stock 71 rad cooler
 

Ran AN fittings and Russell flex lines neatly along the frame right into the radiator cooler.

Re: Transmission lines 4L60e to stock 71 rad cooler
 

I did the sengine thing with my 6.0/4L80 swap. Sure makes a fast easy line install
Its important to get the correct.transmission fittings for.the 4L80.

Re: Transmission lines 4L60e to stock 71 rad cooler
 

Daaaan67-can't send you a private message your box is full. Have a question in another thread about your dbw gas peddle bracket.

Re: Transmission lines 4L60e to stock 71 rad cooler
 

Double-check which is inlet and which is outlet on the trans, as they're not all the same. I don't know which way the 4L60E runs, but for example the TH400 and 200-4R are reversed from one another I think.

Re: Transmission lines 4L60e to stock 71 rad cooler
 

[QUOTE=cosmo2u;7934905]Daaaan67-can't send you a private message your box is full. Have a question in another thread about your dbw gas peddle bracket.[/QUOTE
Ok cleared up some.

Re: Transmission lines 4L60e to stock 71 rad cooler
 

Guys, I'm running a Champion EC369 radiator and will be retaining that for my 5.3/4L60E swap. Can I reuse the lines from the TH350? I would prefer to go that route if possible. My second choice would be to go with AN fittings and line. I know they make the adapters for the transmission side but not sure what I need to adapt the cooler side. According to Champion, the fittings in the radiator are 1/2" 20 straight thread G 1/4".

Re: Transmission lines 4L60e to stock 71 rad cooler
 

You can use your old lines, you will just need adapters maybe at the trans..

Re: Transmission lines 4L60e to stock 71 rad cooler
 

Any ideas which adapters I would need for this?

Re: Transmission lines 4L60e to stock 71 rad cooler
 

Re: Transmission lines 4L60e to stock 71 rad cooler
 

Bringing this back to the top. I have the correct AN adaptors at the transmission (4L60e) now which AN fittings do I need to thread into my radiator? Specs of the EC369 state that the trans cooler fittings are 1/2" 20 STRAIGHT THREAD G1/4. Also which is in and out of the radiator? Top I would assume is the inlet...thanks all.

Re: Transmission lines 4L60e to stock 71 rad cooler
 

Did you ever get an answer about the radiator fittings?

Re: Transmission lines 4L60e to stock 71 rad cooler
 

Inlet is the bottom, you want to push fluid up so it fills the void, if you go in the top it will just fall through and might not fill the cooler.

https://www.holley.com/products/plum...ts/AT991946ERL

Re: Transmission lines 4L60e to stock 71 rad cooler
 

Do you have the part number for radiator fitting for some reason I cant read the number pitcher is blurry thank you

Re: Transmission lines 4L60e to stock 71 rad cooler
 

This one fit perfect for me.