I have a 1980 C-10 and it didn't come w/ the shifter linkage.  I recently purchased a linkage from a member.   I'm thinkin it attaches to the frame and might need a spring also.  Can anyone else confirm this?  Right now I have it running from the column to the tranny and it seems like its too loose/flimsy to shift.  W/O the linkage, it shifts fine so I know its not the tranny.