63 ford unibody,all original,starting losing 1rst gear/then reverse...Adjust clutch/linkage,replaced worn shifter bushings,doesnt seem to have excessive play.Fluid is up and looks clean.Clutch is fully adjusted at this point,I have a very jumpy first gear,and can just barely catch reverse...2nd and 3rd seem to work fine....This doesnt seem like a clutch issue..any thoughts?