Visit Post #2 at THIS Link ...Follow the Download Instructions and then peruse for the GM OEM 2008 Trailblazer Digital Service Manual
(...it will have the right information). Then after extracting the ZIPPED Files and locating the STEERING PDF, refer to How to R&R the various Steering Column Components using the Step-By-Step Instructions along with an Exploded View
(with Discreet Images) Diagrams for Part Numbers and Specialty Tools if required for Dis-Assembly and Re-Assembly Orientations:
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gmtnation.com