Steering column issues

[cgster]

In the process of restoring my truck. When I bought it, it had the original steering column in the truck, the truck didn't run that much so I would only drive it around the block, but when I did if the truck got to moving about 30 mph it would bounce out of gear. I figured when I installed my new steering column and linkage this problem would be fixed but seems like its going to be the same exact way. I haven't driven it around the block yet but when moving through the gears it goes very easily. Any idea what the problem could be?