95 C280 transmission adjustments
 

Is this a vac operated shifting mechanism??? I am experiencing some inconsistent shifts on the car. At low speed from 1-2 it shifts smoothly but when accelerating harder it is noticeably sharper and not quite what I think it should be. In higher gears its shifts very smoothly. Any adjustment than can be made? Possible service issues?

Regarding my other post, the trans fluid is at the proper level.

The modulator pressure (how hard the trans shifts) is vacuum controlled & adjustable.