I have a 2018 Colorado ZR2 diesel, the stock transmission cooler is complete crap. (A way to save $50 on a $50,000 GM truck, you cheaper *******) I typically see 190-205 degrees in daily driving, 220-230 in 4WD SUVs and above 230 while towing just 4500 pounds. Installed it at 15,000 miles and found the transmission fluid wasn't as red as it should be. (Yes, GM says the DEX-VI works up to 270 degrees, but are the internals? Also, these new transmissions run clutch-on-clutch rather than…