3 on the tree won't shift out of reverse

[Tilt]

I finally found a shifter arm for my 3spd manual column. Tore it apart, cleaned, lubed everything, and reassembled. I got it in the truck this afternoon and after starting the truck, it will not shift out of reverse. I can remove the linkage from the column under the hood and the trans with shift into first with no problem. It has to be in the reverse position to remove the key and to start the truck. Any ideas as to what may be hanging up, or what to look for? When I had everything apart, nothing seemed to be wore too bad, just normal wear. On the bright side, I did get to drive the truck, even though it was backwards, for the first time since I've owned it.