I hit 220* after about 60 minutes of driving in the summer. I stay out of the city as she gets to hot to fast. IMO, the factory tranny cooler on these cars is garbage. Ad an aftermarket cooler and you should see temps of 170-180. I need to get off my ass and install the one I have sitting at home.dang thats high.
My big diesel pickup typically only runs around 170F, why the heck do these things run so hot!
Here's some info that I have been compiling over the past while..... http://chrisb.users.superford.org/Grand_Prix/Projects/Transmission_Cooler/Transmission_Cooler.htmlYeah, looks like this is next on the list. I'll check out the oriely to see what they have