When i bought my car a month ago firestone told me that i was going to need to get a trans flush done because the fluid smelled burnt. My car has 67,000 miles on it. I have no clue about how the previous owner kept the car and im 80% sure these are the actual milesI've heard a lot of bad things about trans flushes. What would you guys recommend? I was told that it's better to drain the fluid and just add more. I drive the car moderately hard daily and i plan on doing a few mods down the road.