Thank You All for the added insight!

MXFrank - I plugged the MityVac into the line leading to the trans. She took 20" and after 1 minute was holding steady at 19".

What can I check next?


MXFrank and BioPete - Approximately how much does a transmission rebuild cost? Probably not a DIY.?. :-)

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1988 300 TE - Schnitzel (Daily Driver)
1995 E300 - Betty (Son's Daily Driver)

1987 300 TD - Kraut (Dropped a valve)

1987 300 D - Hans (Need to rebuild engine)