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Message: <blockquote data-quote="someotherguy" data-source="post: 20067" data-attributes="member: 6178">Howdy Vince, welcome from another GMT400'er <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" />The redesigned (many times) intermediate steering shaft and lower column bearing should cure the clunk, and the A/C service ports are fairly simple to replace.  I did the service ports on my '06 recently as they showed signs of slight leakage although the A/C was still working, I knew it was just a matter of time.The steering shaft and bearing I did probably 80K miles ago and it's still quiet, so I guess GM finally got it right.  Probably about similar miles on my wife's '06 as well.  A little bit of a pain contorting yourself under the dash to replace those parts but overall a simple job.  Just be sure you secure the steering wheel with a bungee cord, ratchet strap, something so it can't turn while you have the shaft disconnected, because otherwise the clockspring will become damaged.  It can move a little, that's fine, you just don't want it making an actual revolution in either direction because then the clockspring isn't in the correct wound position anymore.  Anyway, literally a 30 minute job start to finish.This is replacing it on my wife's truck - old vs. new on both items.  My recommendation is GM only for both.  The bearing just pushes in at the bottom of the column tube inside the cab; some gentle persuading at the exposed edge with a very small hammer will start it sliding out.  I ordered GM # 19329330 shaft (currently about $60) and GM # 88963617 bearing (about $33) - those fit '06 models and probably yours too but double check to be sure.[ATTACH=full]1160[/ATTACH]Bungee cord run from the spoke to the shifter kept the wheel in place.[ATTACH=full]1161[/ATTACH]Replacing the A/C service ports on my truck was a snap, even though I didn't have the oddball socket for the high side, I was able to remove it with an adjustable wrench.  It's not super tight or anything, being an aluminum fitting in a thin aluminum tube.  I did need to run down to the parts house and get a valve core tool for the low side as a regular tire tool didn't have enough reach.  "Xtra Seal" brand # 15-3174 you can see on my core support with the black/orange handle got it done for under $7.  The service port kit I used was Four Seasons 26775 which I paid a little extra from amzn to get it here quick, still less than $15.  I used some Nylog blue sealant on the threads and o-rings as well.[ATTACH=full]1162[/ATTACH]Richard</blockquote>