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The Transmission does not have a drain plug like the oil pan. The Transmission pan is located to the back of the oil pan. It is connected by a bunch of bolts. Take out the bolts slowly and keep some of them on one side so you can let it leak out slowly into a drain pan. You will need about 8 quarts of Transmission Fluid (Dexron III Rated) for a 3.8L Impala. Check in the back of your owners manual for a list of different fluid capacities for your specific model.
Personally I put Mobil 1 Full Synthetic fluid in my Impala. Synthetic fluid will allow the transmission to operate at a lower temperature and thus extend it's life. You should probably change the filter too. There was a cheap $20 filter at AutoZone it's rated for 10,000 miles. You are better off getting the AC Delco Filter from the Dealer for about $40. Don't use cheap parts for a transmission; it will save you trouble and help your transmission last longer. A mechanic at GM said the gasket is reusable and should not be replaced unless it's damaged.
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