yeah, NEVER use those flush places... just drive up on ramps, slide under there, and pull the two drain plugs, one in the pan, one in the torque converter. then I also pull the cooler hose connections, and drain the cooler too. gets ALL the fluid out. then drop the pan, change the filter, then clean the pan with brake spray, then put a new gasket on the pan, and put it all back together.
fill the trans with 4 quarts of fluid, and start the car, then add 1/2 quart every 10 minutes checking the level, stop when it gets to the lowest line and go for a drive to get the fluid fully up to operating temp, then park on the levelest spot possible, and get the level perfect at the top line.
done.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!