ok, when I first start the car put it in "D" occasionally in pops into nutural I just move the shifter slightly to get it back in. Now, onceit acted different when I accidentally filled the trans fluid a bit over full, instead of popping out of gear it made a horable sound like grinding... all this only when the engines cold, OR if Im driving a while and park 10 minutes .
Im traleling and about a 1000 miles from home, my main question is should I be concerned, does this sound like a problem that will tipically get worse within a month or less?

I have a 1979 300 TDdiesel wagon. I was told by a tech that the 79 trans' "use springs not vacume" Im now in the Menicino California area.