If you have an automatic, there is no overdrive. How long have you owned the vehicle?

Sounds like a 3-4 shift flare. Can you post a video? Every cel phone today has a video camera built in, capture it with good sound.

There are a variety of reasons this occurs. First, verify the fluid is clean and full. Next most common is the modulator turned down so the 1-2 upshift is tolerable, resulting is low pressure on the 2-3 and 3-4.

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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