5-speed not shifting well

I have a '94 chevy k3500 diesel 5-speed (4+low) When i shift from 1 to 2 to 3 the stick sorta "jumps" before it goes in. From 3-4 its fine...and if I use low to 1 its fine also. Any help would be
greatly appreciated! I'm wondering if this is the clutch..
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