With my car, a 27 mm deep socket works perfectly, i can easily turn the crank (important to go the right direction) from under the car with one hand with the other hand reaching through the opening in the bellhousing with fingers resting lightly on the surface of the torque converter. Turn the crank until you feel the plug, then stop.

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.