Two problems related to transmission noise have been reported for the 2004 Chevrolet Trailblazer. The most recently reported issues are listed below.
I bought my 2004 Trailblazer new in 2004 and it has been ok. I got in it last Thursday and put it in reverse to back out of my basement to go to work. It made a horrible noise so I got my husband up to look at it. Come to find out reverse went out on the transmission. The repair shop said reverse was out and some gears were worn. I had no warning and this just happened. This repair person told us this was weak link on the Trailblazers and the transmissions would go just like that. If this is a weak link, gm should recall and fix the problem. I did not take out the extended warranty and I only have about 89,000 miles on the vehicle.
2004 Chevrolet Trailblazer 2 wheel drive (2wd) transmission failure. Transmission failed while under normal highway operating conditions, speed approximately 55 mph, two lane highway, surface conditions dry, mileage 25605. Failure proceeded by strange noise, then complete disengagement / loss of power. Service engine check light illuminated; later diagnosed by GMC dealorship as an open / loose gas cap as th e cause. The vehicle was manuevered / coasted without powertrain assistance to parking lot adjacent to the highway without injury / incident. Vehicle towed to dealorshi on . 6/15/07) informed by gm representative that component replacement / repair needed, specifics unknown, cost $2400 of which gm would pay 50%; my cost $1200.