4L80E cooling lines

[94K30]

does anyone know which of the lines flows out of the transmission, and which is return from cooler?

[grancito]

The top cooler line is the return top get the air out.

[94K30]

the top one at the radiator?

[grancito]

Yes, at the radiator.

[JD_countryboy]

I was told that the bottom line on the radiator is the return to the tranny. Thats is where i was told to plumb my extra tranny cooler into. I was told top of radiator is hotter, so the cooler in the radiator flows top to bottom, just like the radiator itself.

[grancito]

I'm talking about a cooler that is just behind the grill.

[trukdoc]

...external tranny cooler mounts to front of radiator best at center bottom...plumbs in at bottom radiator cooler line...line from radiator goes to cooler...line from cooler goes to tranny line,,,

[94K30]

...external tranny cooler mounts to front of radiator best at center bottom...plumbs in at bottom radiator cooler line...line from radiator goes to cooler...line from cooler goes to tranny line,,,

Thanks, that clears that up......