Yeah, see if it will go into all gears easily at idle and not moving. If so, the clutch is probably ok and either the synchro rings or the whole synchronizers are worn out. Make sure your fluid is some good quality (GL-5 rated) gear oil. I use the 85-140w multi-weight myself but straight 90W will work too. If some knucklehead put 30W engine oil in it, that could cause it too.
