One problem related to steering linkages has been reported for the 2006 GMC Sierra 2500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 GMC Sierra 2500 based on all problems reported for the 2006 Sierra 2500.
Vehicle- 2006 GMC Sierra 2500hd 4x4 duramax/allison there is a very noticeable clunk/looseness in the steering. I have greased/lubricated the whole steering mechanism with no reduction in the problem. My fear is the looseness will result in a complete failure or loss of steering. Prior to that I fear poor driving/maneuver ability while this issue persist.