I've had my car sitting on jacks for a few weeks now, all 4 wheels off the ground. Since doing this, it's been steadily dripping transmission fluid. The trans was usually a bit moist, but it never dripped when the rear wheels were on the ground. It seems to be coming from round the driveshaft flange area.

Forgive my ignorance of transmissions, but what part do you suppose is causing the leak?

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2010 Mercedes E350 4Matic - 77k miles
1986.5 Nissan D21 V6 4x4 - 276k miles
1987 Mercedes 190D 2.5 Turbo - 3??k miles
1983 Mercedes 300SD turbo parts car
2017 Honda CBR500R - 15k miles
2016 Suzuki GSX S1000 - 9k miles

it's the rear transmission seal, probably.

this is a general procedure for the W123 - Remove Driveshaft and Replace Rear Transmission Seal - Mercedes-Benz Forum

im sure there is a 190D centric guide here somewhere.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car

Thanks! I wasn't sure what it was called to try to find a guide for it.

__________________
2010 Mercedes E350 4Matic - 77k miles
1986.5 Nissan D21 V6 4x4 - 276k miles
1987 Mercedes 190D 2.5 Turbo - 3??k miles
1983 Mercedes 300SD turbo parts car
2017 Honda CBR500R - 15k miles
2016 Suzuki GSX S1000 - 9k miles

good luck! on W123 it's not a huge deal. it also depends on your definition of 'huge deal'. driveshaft has to come out.

if it only happens on jacks ignoring it is an option :-)

__________________
-------------------------------
'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car