Does anyone have pics or install guide for a transmission cooler for the G37s coupe 5AT? I have been searching all over for one and all I find are oil cooler installs.

It's pretty straight forward. I like the B&M trans coolers you can get from Summit Racing, I like the stacked plate design vs tube & fin because they're a little bit more durable.

All you need to do is unhook the lines from the stock cooler on the radiator, and plug them into the new cooler. You'll then just need to find a place to mount the cooler.