loosing tranny oil but can see no external leaks. Is it possible the vacuum connection is sucking oil from the tranny? If so how do I fix?

If you have encapsulation panels/belly pans, ATF might be accumulating before eventually dripping to the ground. First confirm that oil is being drawn by the vacuum pump through the modulator. Pull the lines at the VCV on the side of the IP (not the bigger black one). Do you see ATF dripping? If the vacuum pump is pulling ATF, you might see the engine oil level rising.

Is there transmission fluid in the cooling system?

Sixto
83 300SD
98 E320 wagon