I did the bypass at 137k with no symptoms and my fluids looked perfect. At 147k, my transmission failed. Replaced with used transmission, installed temp gauge. Going up normal mountain hills in 2wd with no load causes trans temp to rise to 220 fairly quickly. I pull over before letting it get any higher. Over those 10k miles before it failed I did one pretty light back roads trip and hauled several small trailer loads short distances. I'm in Portland, OR where it's not particularly hot. I'm 99% sure that I fried my transmission by doing this bypass with no added cooler. Thought you guys might want to know.