[engineer_gregh]

Thanks. It did resolve the problem. I would run about 190 degrees at 45mph and about 195 at 60-65 mph. I removed the extra transmission cooler strapped to the a/c condenser and it lowered my 60-65 temp down to 192. If I got into traffic it would creep up to as high as 210-220 degrees especially if I was running the a/c. We tried a high volume water pump, 7 blade fan with clutch, water wetter, straight water, 50/50 mix, and a small electric pusher fan on the a/c condenser with no real results. The best improvement was removing the external transmission cooler. When using an infrared heat gun we were only getting a 3-4 degree drop between the bottom of the water pump and the thermostat housing and 10 degree drop between the drivers side and the passenger side of the radiator. You should see a ~40 degree drop between the drivers and passenger side of the radiator. We installed a new 4 row brass radiator and it was not as good as the original 4 row that was on the truck. Now it never goes above 190 degrees and most of the time stays at just over 180 with or without the a/c. I do notice the fans run more with the a/c on. Huge improvement. By the way the Griffin holds almost 3 and half gallons of 50/50 mix. I'm only running the 50/50 mix with no additives. Griffin will void your warranty if you use water wetter or such. I hope this helps. It was a lot of hard work and frustration, so hopefully this helps someone else from weeks of troubleshooting.