It's an 85 300D. I'm looking at everything under the hood. My wife is experiencing weak shifts and clunks upon down shifts. The locking system is intermittent too.
I drove it, and under acceleration, shift points seem normal. The vacuum pump is pulling 23#mm at idle but doesn't seem to increase when I rev the engine.
The vacuum going into the shift modulator is around 12#mm at idle and increases to about 15#mm revved.
84 300SD (sold)