Lumina hard shifter

99 lumina 3.1 liter w/100,000 miles. What is the cure for hard,stiff movement of the column shift. It is especially stiff when cold and improves as the temperature warms but still more difficult than normal

I am assuming that you have an automatic transmission. There is a shift cable running from the column shifter to the transmission. This is probably failing. It is not a difficult job to replace it and your car will be shifting as good as new.