Unfortunately GM didn't put a drain plug in the transmission pans. You'll need a transmission service kit which will have the filter and new pan gasket. Put a large catch can under the pan, loosen all the bolts and crack the pan loose from the transmission and allow the fluid to leak out. Next remove all but two bolts letting the fluid drain as you go. With one hand on the bottom of the pan supporting it remove the last two bolts. Lower the pan down and drain the rest of the fluid out. The rest is pretty simple and hopefully less messy. Wiggle the transmission filter out, remove the grommet and replace it with the one supplied in the kit. Clean the pan, especially the magnet of metal shavings. Clean the gasket surfaces. Place the new gasket on the pan and thread a bolt in each corner into the gasket. Bolt the pan up and refill with transmission fluid.
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