1997 Nissan Frontier truck wont go into gear

I have a nissan 97 hardbody. I have never had any clutch or transmission problems, Yesterday I went to drive and the truck wont go into any gear, With the truck of it shifts into all gears smoothly with no problems. If I put in gear and then start the truck ,,the truck will jerk forward while I have my foot on the clutch. I have replacedthe slave cylinder and a new master cylinder. I bleed the line real good and still wont go into gear. What is the problem?? I don't won't to purchase a new clutch kit if there is something else that might be the problem,,help!!!!!!!!!!!!