Torque converter drain plug is on the torque converter. It needs to be rotated until it is at the bottom and visible through the window. As always, use only the MB specific 722.6 tranny fluid in 722.6 trannys.

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Ali Al-Chalabi

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