One problem related to vehicle shudder has been reported for the 2004 Chevrolet Trailblazer. The most recently reported issues are listed below.
Car has a vibration when the speed is held constant. Been to the dealer twice, they found that all for tires were out of balance. Problem still there, gave one tech ride because they could not replicate, he said it was unusal but he was front end guy, second tech and service manager said it was normal, not sure if they were able to replicate. Was told to bring it back when problem got worse or broke.