Overfilling will cause foaming if the fluid reaches the gear sets. The foam will cause the tranny to slip and overheat (compressed air is "springy" unlike pure hydraulic fluid, so the clutches slip, and it won't transfer heat worth diddly, so the cooler doesn't do much). Driven for a while like this, espeically under load, and the tranny gets fried.

Get the extra fluid out -- drain at the filler tube or suck it up somehow, then see what happens. Serious overfilling will cook the tranny pretty fast. Minor overfilling and short distance driving probably won't hurt much.

If the T on the vac modulator still turns, it's probably OK.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!