One problem related to speed control springs has been reported for the 2005 Chevrolet Trailblazer. The most recently reported issues are listed below.
I purchased my 2005 chevy Trailblazer in the spring of 2007. Around December 2007 my speedometer started hanging up. It is still doing it today. The worst time for it to happen is on cold days. I did not have a problem with it this summer. Now with the fall of the year and colder days, it has begun hanging up again almost everyday. Because of this I am not sure of my correct speed. I searched the internet and found multiple complaints regarding this same problem. Chevrolet has issued many recalls on other makes and model, but has yet to issue a recall on this problem. I feel this is a safety issue that needs to be corrected on this make and model, as it has been on others.