Earl
This is a 10 to 15 minute job, at most.
10mm nut at both shifter peg and shaft.
take off the shifter pef.
take off the shifter shaft. (use a long extension and a universal joint with your socket.
Gently pry off the shifter shaft.
Clean the seal area.
Scew in a short screw into the old seal. Then pull it out with pliers.
This will remove the old seal.
Oil the new seal and replace. tap it into place and put everything back on.
