Hi there,
If you just drain the oil in the pan you only change about 1/2 the transmission oil, the cooler and torque converter will not drain this way, with the flush you replace all the oil, if the old oil is very dirty it will mix with the clean oil and decrease the life of the new oil.
Mark (mhpautos)
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Monday, May 10th, 2010 AT 3:50 AM