240 Autobox trouble

[Burgenlander]

Hi everybody ,
Been having trouble recently with my 83 240 D transmision.
It will when cold not shift until the highest RPM is met which is like pulling my finger nails out thinking that poor little motor has to run like that. Then when it gets warm it will sometimes work ok and then sometimes drop through the gears like very fast and at low rpm. I have 7 pounds of vac. at idle and 3 at a higher rpm is it tranny or is it a vacuum problem?It has 153,000 miles on it. Thanks ffor any help
Burgenlander
240D
380SL
380SEl
E300D
ML320
Suburban