I have a 2005 trailblazer that is stuck in 3rd gear why

SOURCE: 88 s10 pickup truck will not shift from 3rd gear to overdrive

need more info i had a 1984 chevy half ton and first, second, and third worked fine but lock up didnt work. the problem was there was no vacum at a switch under the hood on the fire wall also your shift linkage could be out of adjustment. try driving down the road and raise up a little on the shifter.

SOURCE: automatic transmission bangs into gear.

sounds like a bad u-joint. when it wears out it will allow play in the drive shaft, causing it to make a bump while shiftinf

SOURCE: 97 chevy truck 1500 gear shift gets stuck in park

You can remove the interlock off the gear shift or maybe spray some crc on it otherwise probably a loose wire or switch

SOURCE: 2003 Chevy Trailblazer LT gear shift won't move out of park

The park shift lock needs adjustment. The solenoid that locks irt inplace maybe the cause of this

SOURCE: my 97 chevy blazer won't shift past 3rd gear

Drop the pan, odds are the shift solenoid is out, its located at the front of the trans on the driver side. I'm sure your check engine light is on that will comment about the timing/shift solenoid being bad. I had the same problem with mine. The solenoid had plastic coming out of the inside. To remove it you'll find a small C clip holding it in, just take a small screw driver and pull the clip out. The part cost me like $36 from my local dealership. And its a longer solenoid. I believe its the 3-2 downshift solenoid. I do have the part number if you need it.

Testimonial: "Thank you so much. I actually thought this was the problem, but i didn't know. Thanks again!! send me the part number"