Tranny service is a piece of cake on these cars. Unlike a lot of other makes, MB has a drain plug on the transmission and convertor. Both take a hex drive, 6mm I believe but dont quote me on that. Make sure everything is clean in the area before starting.

For the torque convertor, turn the engine with a deep 27mm socket and ratchet by the crankshaft nut and feel for the drain plug to become centered in the "window" on the housing.

Drain the filter pan, remove, install new filter & torque the filter to 7Nm/5.2ft-lbs. Pan bolt torque is the same.(Threadlocker is a good idea) Tranny drain plug torque is 14Nm/10ft-lbs and convertor drain plug is 15Nm/11ft-lbs.

I used Castrol Dextron III (Haynes manual says Dextron II). Capacity (turbo) 6.5 qts. Start with 4 qts then add to bottom full line. Top off after the trans is driven and warmed up. (You will be adding 100mL several times) With our current heat that will be accomplished by a drive around a city block!

The pre-formed cooling line was about $50 from the dealer. With new rubber-lined clamps you will be all set! ( I had to retorque the pan bolts about a month later, due to leaking, but have not had any issues since.)

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Sam

84 300SD 350K+ miles ( Blue Belle )