Wondering if some of you can help me out. I am about 500 miles away from hitting 100,000 miles on my 2002 2500HD Silverado with a 6.0 gas engine. As part of the 100K tune up would you even mess with the trans fluid? I mean, would you drain and add new fluid, flush and add new fluid or just leave it alone. I ask because you always hear horror stories about transmissions that are flushed and then problems start. This truck has been GREAT to me. Not one issue at of the ordinary in 7 years. I don't want to create a problem. So I ask, what would you do?