86 gt 5.0 ok at first shifting is easy but after running for a while (20 min or so) shifting gets hard. Specially 1st gear, its hard to put it in gear at times i force it in n when it gets to hard i just start off in second gear. Da clutch pedal is also hard like a mofo (im gonna end up with a strong left leg lol). is all this a sing to change the clutch? would that solve my problem. any help or advise would be great.