Just wanted to clarify on garycrist procedures concerning the refill process. The following is taken from my service manual. For me to reach that required temperature I had to drive the vehicle for awhile. Just by sitting parked and idling, the temps would not go up enough. After I had drained the fluid I refilled it with a little more than I took out before driving.
Connect the diagnostic scan tool to the vehicle. Monitor the TFT PID .
With the engine running in PARK on a level surface make sure the transmission is at normal operating temperature 85-93° C (185-200° F).
With foot on the brake, slowly select each gear position, stopping in each position and allowing the transmission to engage.
With the engine running in PARK, remove the oil leveling plug.