I have a 2001 Yukon SLT that I purchased brand new and has never ever had any maintenance done besides oil changes, tires, battery and a few serpentine belts. It has 246000 miles on it and runs like a champ. I would like to have my transmission fluid flushed but from recent experience on older GM's once you flush the transmission, it never quite works the same. is it a good idea to flush mine or leave it as it is. the fluid does need to be changed. its not red anymore like is should be. everything on this truck is factory and has never had any maintenance work. I'm a firm believer in if it aint broke, dont fix it. Any suggestions????????