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That is called the sector gear.
http://www.summitracing.com/parts/rnb-83221?seid=srese1&gclid=CNml3Oi_psQCFdcWgQodgzgAmw
http://www.steeringcolumnservices.com/gm-buick-cadillac-chevrolet-oldsmobile-pontiac/rack00-rack-sector-gear.php
Google search, "gm steering column sector" for tons of hits.