saginaw 4 speed linkage.

[jimfulco]

Look at the instructions real close, and make sure the shift rods are facing the right direction, and that they aren't interfering with each other. Putting the front rod ends in the shift arm holes closest to the pivot point will give you a shorter throw, but it does make it harder to shift.

See if there's any way to loosen the grip the big central through-bolt has on the shifter levers so they don't bind and try to move together, but without making the whole shifter loose on its mount. Might also have to over-ride the "dry film lubricant" with some spray lube such as BreakFreeCLP or TriFlow. They didn't have dry film when I had mine, so I had to hose it down with oil once in a while.

Also, be sure your clutch is adjusted properly so it will completely disengage when the pedal's down. If it's still slightly engaging, it will be hard to shift.