One problem related to driveline center support bearing has been reported for the 2003 Chevrolet Trailblazer. The most recently reported issues are listed below.
While putting the Trailblazer into any gear it makes grinding noise in rear. While driving to the dealer the rear of the blazer was all over the road. It felt like the rear wheels where going to fall off. While still many miles away from dealer for service the back axial locked up making me loose control. This was at 25 mph. Thank goodness I did not take the highway. I dont want to know what would have happened at 65 mph. I had to have towed to dealer from there. I was told that a bearing breaking caused this. However first I was accused of having the vehicle 4 wheeling.