Can someone please tell me what is an auto gearbox-vacuum box?Am refering to a w124 tranny. Where is this vacuum box located and how important is this box and what bdoes it do to the tranny. Thanks

Hi Roland,
The piece in question should be the modulator. It's on the driver's side of the transmission about half way back. It senses engine load through a vacuum line to control the shift points. There are other inputs from the throttle cable and kick-down switch.
If the car is a diesel, there is another vacuum related piece on the injection pump that sends a signal to the modulator. Either one is important to proper
operation of the transmission. What is the car doing?
Regards,
Randy D.

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W.R.Durrance
ASE Master Tech
Mercedes Tech 21 Years
68 250SE
68 SAAB 96 Ice Racer
69 300SEL 6.3
70 300SEL 3.5
81 300TDT
W.R.Durrance Engineering

The vacuum box is M.B. term for the vac. valve on the I.P. near the alda, it controls vac. to the modulator and egr.

Thanks Durrance and JerryB for the inputs.
The car engine was not firing...plugs were foiled and tranny oil was close to zero....was told that the vacuum box was faulty...it was replaced..and it drives well now..