[jbclassix]

Do you have the linkage between the two rods? There are interlock pins between the rods, they prevent the rods from moving out of sync from each other. If you are in 4-Low, then both rods should move out at the same time to NEUTRAL. then the top rod should move out one more time to 2-HI, then the bottom rod should move out one more time to 4-HI.

If you are trying to get the top rod into 2-HI with the bottom rod in 4-LOW then it will not go because of the interlock pins.