So I am looking at possibly getting an 07 GXP. 136k miles, the dealer said the trans looks new.

I am curious, what should I look for? Most common issues?

The trans on this, is it 3.29 or 2.93? (Just curious about that part.)

I have heard a lot about a trans cooler and shift kit. What do these normally run installed?

Any insight would be helpful!
Advice/Warnings/What to look for