Hello,
I am new to the forum. I just bought a 1984 300sd. I like the car a lot. I got the car and had the valves adjusted, changed all fluids and filters etc. I have all of the rocords back to the window sticker.

THe problem is that the other day the car stopped shifting out of first. At first I thought maybe the trans had gone out, but when I went to lock the car I discovered the vacuum locking system was no longer working as well. I am assuming some wort of vacuum system problem is the culprit. The trans fluid is in the correct place and the transmission shifted before without flaring etc outside of a slightly stiff first shift. Where should I start or what should I test? WHat are thpossible problems?
- Bad Vacuum pump?
- Bad vacuum modulator?
- just a single loose hose?
- Bad shift control valve? (Is this what it is called?)

Anyway. I work on my own cars volvos, vws etc...
I have a mightyvac...
Thanks for your help,
Benjamin