My 85 300SD shifts from 1st to second to third quickly, and I am in 3rd by 20MPH. And the engine is lugging to pull it. At part throttle.
IF I am at full throttle then it shifts fine, and a little hard.
This does not seem normal, because the car struggles so hard to get going.

What controlls this and how do I adjust it? I have not found a vacuum module, or a bowden cable.



thanks
Doug

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83 300SD Dark Silver Dark brown inside