My W116 300SD automatic transmission jerks repeatedly in the 1-2 upshift when lightly accelerating -- like it can't make up its mind whether to shift into second or not.

It only does it when the car warms up.
It only does it on the 1-2 shift.
It only does it when lightly accelerating -- it shifts solidly when I accelerate hard.

There is no slipping occuring - it seems to be switching between second gear and neutral (or maybe first). The only way I've found to get around this is to hold the trans in first gear until revs are high enough to ensure a solid shift.

Crazy thing is that it started happening when I changed my fluid and filter. I'm considering changing the fluid/filter again just to see if that happens to fix it.

Thanks

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'79 300SD W116

The trans in your car uses electronic kick down to achieve 1st gear. I have never seen what you describe but the controller goes bad all the time. It is located behind the passenger side kick panel.

I think I would disconnect the controller and manually shift to first. AS soon as the car moves off move the shifter to D and see if the shifts are the same.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician