I had a thread out for a month and got no replies asking if anyone had installed a rear sway bar on a 2006 QC. No one had done it so I took the plunge and ordered one from Summit. I talked to Hotchkis, Helwig, and Adco. Not one of those companies could verify 100% if there rear sway bars would fit a 2006 QC. I did not want to drill into the frame so I ordered one from Helwig which stated "NO DRILL". It installed no problem. Only issue I had was the U bolts were too short because the SRT10 axle is different than a 1/2 ton. I contacted Helwig and they sent me new U bolts and want pics of my install to revise the application guide. The truck still rides very smooth, no rubbing or dragging, and handles a little better on the twisty roads leaving me very happy with the set-up. Hope this helps someone looking to add a rear sway bar on a 06 QC.
Thanks!
Thanks!