'64, 65, '66 are are each their own year column, as an assembly, due to the small model year specific dash filler panel which is captured/slides up & down under the bowl on the outer tube of the column. With column disassembly, these small filler panels can be swapped & one year of early column can be turned into another.
'67 Pontiac A-body colums are one year only, due to energy absorbing design & larger diam lower bowl. Though with modification to the dash bezel opening, have examined the results of the installation of a '67 energy absorbing column into a '65 GTO. The energy absorbing design of the '67 & 68 columns included the expanded metal design of the outer column tube (mast jacket) as well as the first collapsible strg column shaft.
In '67, there were also two different styles of floorshift Pontiac A-body non tilt columns. The most common style, at the lower end, it continues the tulip shaped end that is welded onto the shaft. This is what bolts to the rag joint at the strg box. On '67 GTO's factory equipped with the 400 HO engine (RA exhaust manifolds), the original '67 column utilized a splined lower shaft with a bolt-on cast iron flange for ease of column installation/removal. This removable cast iron flange was same as used with '67 & '68 tilt columns.
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Buzzards gotta eat... same as worms.
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