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Canadian Poncho Homepage -> Canadian Poncho -> 65-70 Full Size Power Train Tech Forum -> GM Rad. Transmission cooling line flare fitting size?
Post Info TOPIC: GM Rad. Transmission cooling line flare fitting size?
cdnpont


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GM Rad. Transmission cooling line flare fitting size?
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Generally, on GM Radiators circa 67, what size are the line fittings?

Are they 1/2-20 Inverted flare?

Cheers, Mark



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65 Laurentian post, 67 Grande Parisienne 4 door HT. 
 
JC2+2


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Should be a 5/16 line so just a standard 5/16 flare fitting is what you want. Are you replacing the end or trying to repair threads?



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66 Grande guy


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I just fixed mine up and normal 5/16ths worked fine.

 

 



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ken from northern Alberta

38 Willys pickup electric

39 Buick (327 with 700 r4)

66 Beaumont 4 door hardtop

69 Chevy CST pickup

1976 GMC 23'  motorhome

1994 Impala SS (temporary, according to my wife)
cdnpont


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I'll be adding a aux trans cooler and don't want to go with just rubber hose. I want to do an inverted flare to AN-6 adapter fitting on the rad cooler outlet. I'll go with pre made braided lines to and from the aux cooler.

You say the threads of the female cooler inlet and outlets are 5/16?  Or are the lines 5/16?

Cheers and thanks, Mark



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65 Laurentian post, 67 Grande Parisienne 4 door HT. 
 
4SPEED427


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cdnpont wrote:

Generally, on GM Radiators circa 67, what size are the line fittings?

Are they 1/2-20 Inverted flare?

Cheers, Mark

 Yes, that is the correct description of it Mark. I had to look in the Weatherhead book to make certain before I replied!

1/2" OD, 20 threads per inch.



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