Two problems related to suspension have been reported for the 2005 GMC Sierra. The most recently reported issues are listed below.
2005 Sierra 1500 4x4 I bought this truck new 01/ 2005, the rear spring shackles failed on 02/20/2014 due to rust, I took it to the dealer and they said the rear 3ft of frame is badly rusted making it not roadworthy. Gms position is that this is somehow neglect on my part and will not do anything. The body of the truck is not rusted and still looks good. I find it unreasonable that a 9yr old truck with no body rust should have the frame so rusted as to make it unsafe to drive.
I have issues with my alignment, dealership can not fix the problem it has been in service 9 times for the alignment. I also have knocking noise and a steering shaft problem again dealership has not resolved the issue.