Sorry You Felt Confused, Glad You're Running Again
Greetings Koon Koon,
Sorry if I confused you on the issue, but like Steve said, and I guess I assume too much sometimes. You either have a mechanical linkage shift or a vacuum controlled shift. After you mentioned the modulator, I knew you only had a vacuum operated shift, but I think you understood us all to think you should have both for it to work properly.
Glad to hear the beast is up and shifting to snuff again, takes more than that to kill a MB tranny. A lot of parts that are supplied either as original or aftermarket just contain the wear, so to speak part and not the attaching parts that generally don't wear out at the same rate.