You are going to remove the non tilt unit anyway, so just remove and line up side by side. Doubtful you will need any changes if columns are in same production year range.My 80 Malibu has a factory floor shift (automatic) steering column. I recently picked up a tilt floor shift column from a later model (not sure the year) Monte Carlo.
What do I need to know (differences) when installing the MC column?
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