First, why did you change the linkage? Were you having the same shifting issue? If not then you can try this : Remove the linkage from the shifter arm it's connected to and while pulling the clutch see if you can move the arm the linkage was attached to back a notch.(2nd gear) Then try another notch.(3rd Gear) If you can then your linkage length is off. Go back to neutral and adjust your linkage. Hopefully this will resolve the issue. Good luck!