My new to me 84 300 TD has a couple issues that I think are related. 1. Sometimes I get nothing when I turn the key unless I mess with the shifter in the park position. And 2. When I'm driving at certain high speeds, under load I hear a rapid ticking noise, almost like valves but a little more plasticy. I noticed the other day that if I pull back just a little bit on the shifter the noise goes away. Hopefully this is some simple cable or linkage adjustment.