Probably good to step down to 3/8 or 1/2 depending on the flow of your transmission cooling circuit.
I normally use hydraulic hoses for trans coolers as they are much tougher and cheaper than building AN lines. There is slightly more weight, but I feel that's ok on a prerunner / play truck. SAE 100R1AT Hydraulic Hose works good and is rated to 2250 psi.
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