It is a round dougnut looking piece that is bolted to the flywheel and connected to the transmission's input shaft. The housing rotates with the engine, therefore the engine and thus the torque converter must be rotated to locate the drain plug to the bottom.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record