Do the 87 190E 2.3 have a similiar transmission to the 300E's?

I've got a 190E that is not shifting well. I've done a search through the threads but nothing to guide me.

Is there a vacuum modulator that can go bad?

It is a car with 200k and I don't know it's history. Anyway I can look at items to reduce the severe "bam" it makes going from 2nd to 3rd?

Thanks in advance.

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)