Both of those diagrams show everything on the engine side of the columns too. The JBG diagram Steve linked to was for a later version and Vipers was an earlier version.
There is a bearing and retainer system (a euphemistic phrase if there ever was one!) at the lower end of the column where the shaft exits.
Unfortunately, we see all sorts of variations on columns from, you guessed it, 1974 Broncos! Here are some of the parts we sell at least that fit your column:
http://www.wildhorses4x4.com/category/Bronco_Stock_Column_Parts
The early model used a separate bearing and inner race and a bolt on clamping collar to retain and tension things. Later ones (through '75 at least) had a semi-sealed bearing assembly, but usually still used the retaining collar.
Is yours manual or power steering? One long piece or two-piece with rag joint?
Either way, look for a collar around the shaft (#3D681 in Vipers diagram) and, while someone is pressing firmly down on the steering wheel to push the shaft down tight, slide the collar up into the bearing race and tighten it down. This will tighten things up if the bearings are still there and in good shape.
If any of that stuff is missing or buggered, simply replacing it will usually fix the issue.
Might as well do the top bearing too, while you're at it.
And speaking of "while you're at it"... Maybe replace the turn signal switch if you have to pull things apart anyway. If it's working perfectly, maybe not. But if it's even remotely recalcitrant (today's official steering column word ;D ) it's probably worth it to save time later.
Good luck. Hope some of that made sense. But look closely at yours and compare to the pics above.
Paul
