I remember those days, my first truck was a 71 C/10 with 3 on the tree. Mine used to do that all the time.That was a common problem with 3 on the tree. Basically when the linkages wear out, they tend to hang up when going from first to second.
My shift tube actually broke because of that and I had to replace it.
What a lot of us used to do was remove the shift handle and put a hurst on the floor and be done with it.

Last edited by JeffL; 09/23/2012 9:02 PM.