On my '88 Velvet drive, the shift cable locks into a bracket on top of the transmission with a simple clip that can be 'opened' or 'closed' manually with no tools. You could easily check whether the linkage is causing the issue by opening the clip and pulling the cable away so it isn't operable. Then, while still 'cold', manually shift the transmission linkage into gear using the linkage on the transmission, not the throttle (you might want to be away from docks, etc. if you're by yourself). Again, no idea how your transmission is set up compared to what I'm familiar with. In my limited experience, just looking at the cable moving the linkage into F-N-R doesn't really tell you if it is slightly out of adjustment or not. The adjustments can be very slight.
1988 Tristar 190 Sport, 351W w/GT-40's, 1:1 Velvetdrive
Last edited by MikeyOrange88; 12-03-2012 at 05:56 PM.
Reason: clarify wording