w124 tranny question
 

I have a 94 e320 with a Meredes rebuilt trans(30k miles), in comparison to my old '91 190e 2.6 and a '91 300e 3.0 I just drove, my car doesnt shift nearly as nicely or as firmly, in my opinion its rather soft. Question, are these all the sames trans(maybe the 4th rebuilt one I have is no good too?long story,,,) and if not is there a way to improve the shift feel in mine?
Thanks,Chris