My original plan was to swap my fluids every 40-60k miles to prolong the life of my car so i planned on flushing the coolant, changing the oil, and flushing the tranny. Im going to get my transmission done professionally, and my oil is simple to change every 3k; however, after doing some reading about breakdowns post coolant flushes, im not sure if i should do it or not. Any advice?

I have an 07 S/C with 70k. Would a drain and fill be better, to stay on the safe side? Or should i not do that either?