I used my mity vac to pull some fluid out just to check on the color.. it looks like mud. Smells a little funky, but not terribly burnt. I am getting a funny 2-3 upshift when the car is warm.. all other gears are perfect up and down. Do I dare change the fluid and filter or is it a death sentence? Car has 230k.. trans supposedly last serviced at 160k, although I have no documentation.