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I have striped down my 77 t and t steering column, as i knew it seemed to have missing parts. Early research highlighted the need for Jim Shea's info papers, which have been awesome, and helped to identify what parts are missing. An issue i have found and need help, is parts for the key release lever. It looks like there should be an outer cover and internal parts, located just below the key cylinder location, but cannot find any information on any of this.
Not sure what drawings if any you may have found going through Jims papers?
Here are a couple pages from the 53-82 Corvette Parts & Illustration Catalog showing a breakdown of the T&T column.
There are several parts used on the 77 column that are 1 year only parts...
I put a RED arrow pointing to the Cover section, most of those parts are 77 only...
Items on the right page would direct a counter person to the correct Gr. (Group) number then to the correct part number...
Items 74-85 are 77 1 year only parts...
Hope these drawings help...