can you downshift or upshift?

IF you cant do either or just one of them then you have a bad governor or hydraulic problems with the transmission which include stuck valves in the valve body, bad/worn out seals within the tranny.

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)