Hi!
I'm a 55 year old guy who finally scratched that itch and bought my vette. It is a 2002 Red Convertible with LS1 and 4 speed auto.
I've owned camaros,firebirds and Trans Ams. But I've always had my eye on a little Red Vette.
I'm doing my own maintanence on it, I've changed the oil and I just changed out the thermostat and coolant
I know the LS1 engines run hot, I know the cooling fans kick on at about 228 and 235 respectivly.And they work like there supposed to.
What's got me concerned is the transmission temperature.
Outside tempratures around south Louisiana get pretty hot. Last 2 days the temperatures hovered around 97-101 degrees Fahrenheit.
While driving around with AC on, Temps on the tranny held about 10-15degrees below engine temp, which was 220.
One of the first things I did when got the car was replaced the transmission with a GM Rebuilt. The original one was slipping and GM owns this new one for the next 3 years/100,000 miles.
Do these temps sound about normal?
Should I install an aftermarket Transmission oil cooler? I've heard these will void a warranty.
Where should I tie it in? On the top transmission line going into the radiator or the bottom one?
Any info you pros can give me will be appreciated.

 

Your temperatures sound normal and should be fine under normal driving conditions. I do believe that auxiliary transmission coolers can extend the life of a transmission by reducing the temperatures under high load conditions.
I've had one on every automatic car I've ever had and have always installed them in series and downstream of the existing cooler in the radiator. Some will tell you to install them as stand alone units, but without knowing if the heat rejection capacity of the aftermarket cooler is sufficient for your application, I would not do so.
As far as the warranty issue is concerned, it's never been a problem for me. I can't see why a properly installed auxiliary cooler that is in series with the existing cooler would present a warranty issue. You should probably consult your dealer on this question.

 

I've been watching mine the last couple of times I drove it because I'm getting ready to install a Vigilante torque converter and I want a comparison before and after. I have my fan temperatures reprogramed and run about 196° - 200° almost always.

It was about 85° the other day with quite a bit of driveing around town and the highest the transmission temperature went was 178°. I'm going to drive it a little harder next time it's warm out and see how high it goes but I don't belive I've ever seen it higher.

Hope this helps,