You have either a bad gauge or a bad sending unit on the transmission temperature. Although Newell transmission run pretty cool, you should be seeing temperatures in the 150-160 range after the transmission warms up. You will rarely see the transmission temperature exceed 180 unless you are tied up in rush hour traffic or pulling long steep grades.
If you pull the radiator for repair have them rod it out at the same time. Crud builds up inside the radiator and restricts water flow and heat transfer. That will be a good chance to clean off the intercooler at the same time since you will be able to get to both sides of it. Any oil and dirt that gets back there reduces airflow.
A good radiator is the key to a long lived 8V92.
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