Transmission cooler line fitting sizes

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cooper30

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Maine
I've done some searching but haven't found the answers.

1998 Tahoe 4-door 4x4 5.7l

I'm going to replace the rotted hard cooler lines with braided hose. I'm replacing the line that runs from the trans to the radiator, and the one that runs from the (factory) aux cooler back to the trans.

This is what I've come up with so far....

--Threads at trans are 1/4-18 NPS.
--Threads at radiator are 5/8 inverted flare

I cannot figure out the threads at the outlet of the aux cooler. Does anyone know?

Thank you
 
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