I am still a little confused about which transmission our 1988 300TE has.
722.4.... or is it a 722.3?

Car has 69k on it now and the fluid color "looks" ok, but as we have no records we dont know when it was changed last.
Shift fine about 98% of the time, but I have noticed a slight slip on the change from 2 to 3 when cold.
Previous owner gave us a filter and gasket and said they had planned to do it.

What fluid should we use... MB only... a Synthetic like Mobil 1 ... or just a good quality normal fluid?

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2009 Mercedes ML320 Bluetec

It's probably a .369 but if you really want to know go to the dealer and ask them to run VMI. Good idea to change it if you don't know the history. Dextron III should be fine.

dextron 111 is fine,don't forget to drain torque converter.while you're there tighten the modulator one turn to account for the slight slip.

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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg

I'm going to try this too. So tightening would be clockwise? Would this be one turn of the wrist or one full 360 degree turn?

360 degrees.

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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg

Here's a nitpicky but slightly relevant point: note that it's Dexron, not Dextron.

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Steve
'93 400E