alright - I have been recently replacing my front suspension system - it has been going relatively well - however - I must now focus on my transmission.

There are a few issues to deal with - I don't want to rebuild or buy a new transmission (I hope I don't have to anyway).

To begin I have a W123 1983 300D automatic transmission.

first and foremost when I put it into park 'P' it does nothing for me in terms of not allowing the car to roll. As in when or if I park the car on any incline - it will roll unless I use the e-brake or turn the wheels inward towards the curb and let it rest there. This problem doubles because my emergency (or parking) brakes need to be replaced - the pads are busted and need to replace them (I did already tighten with the screwdriver method - not much help unfortunately - worked a bit for like a week). The other day I chose to go to a restaurant with a drive through so I wouldn't have to park...

second - first gear slips and takes forever to get to a decent speed and switch up to the next gear. I briefly read there were someways you can adjust the vacuum system to possibly correct problems like this - is this true?? is it possible I do not need to rebuild or replace my transmission? I have never worked on the (or any for that matter) vacuum system or transmission. I did check the tranny fluid level - is ok.