700R4 cooling line flare nut size?

[zcarczar]

Ive searched all over the place trying to find the freaking size of the 700R4 cooling line size. They are flare nuts like on a brake line and use a 1/2" wrench. Im trying to figure out my cooler situation and am going to use AN lines if at all possible from the the rad. to the cooler and back to the cooler line.

 

[gm4x]

[ QUOTE ]
Ive searched all over the place trying to find the freaking size of the 700R4 cooling line size. They are flare nuts like on a brake line and use a 1/2" wrench. Im trying to figure out my cooler situation and am going to use AN lines if at all possible from the the rad. to the cooler and back to the cooler line.

[/ QUOTE ]

I was thinking there are brass adapters (inverted flare) screwed into the trans case, screw them out & take them to parts store w/you.

 

[84_Chevy_K10]

They're 5/16 flare.

 

[BobK]

I believe a 5/16 to 3/8 line would be a -6AN fitting.

 

[R72K5]

5/16" is what GM has always used for gas engine auto trans cooling lines

good luck