We have the above mentioned vehicle.We bought it with 110k miles in 2006.IIRC I did a drain and refill a year or so after purchase.In 2014 the vehicle developed a hard/bump shift going 2-3 and would drop out of over drive hard.I did a drain and refill with a gallon of Supertech Dexron/Mercon ,that got rid of about 70% of the problems.About 2 weeks ago I did another d&r with 3.5 quarts of Warren Dexron/Mercon.After this the bump shift 2-3 is gone and no more hard drops out of o/d.We now have 180k on the vehicle and it is shifting butter smooth.The fluid has never darkened or developed an odor.I'm hoping to get to 200k in this vehicle.