Hello to all- this is my first post on your forum-I recently bought a 1987 300 SDL-can't get over how good it looks, BUT- I have felt as if my trans was shifting early and so softly as to be nearly imperceptible, -occasionally it would take higher rpms to shift- then last week, after fuelling up, it would not shift from 1st- can anyone direct me to a diagnostic/ service manual that covers the transmission and vacuum systems for this vehicle so that I can check it out myself? Also needs lock work- Thanks!