Aftermarket trans. cooler question

[Alex]

Hi all, I’m going to install an aftermarket transmission cooler on my ‘91. Can anyone tell me which of the two transmission cooling lines connected to the radiator is the return to the tranny? One line is on top of the other on the right hand side of radiator. My manual is useless. Thanks in advance.

 

[mudhog]

top = in
bottom = out

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