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I have my W203 (Automatic Transmission 722.6) that is killing me with this whining noise when i let the release the gas pedal and the sound change intensity depending on the speed. It starts when decelerating just under 100km/h, it increase until the 50 / 55 km/h and then it goes down again. It stops when i go under 20km/h. Noise Chart

There are no error codes and someone say it can be the GearBox but it costs a lot to repair, someone else say it can be the differential.

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  • Do you know if it does it in reverse?
    – HandyHowie
    Commented Aug 29, 2019 at 10:36
  • I didnt tried it in an elevated speed in reverse but with a common reverse it doesnt Commented Aug 29, 2019 at 10:43

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What I would do is try and identify were the noise is coming from. This might work. Jack up the drive wheels,run the engine and with a long steel 1/4 rod with a wooden bung on the end touch each part of the engine, gear box,diff,wheel hubs,etc., with the bung on your ear. That would tell you if a bearing was suspect. This system is used to ident leaking water pipes in in the ground even today. It is great fun when you hit the right area. 6MM x 1m screwed rod can be got from diy outlets. Good luck.

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