The problem is the bushing inside the end of the gear shift cable has worn or broken to the point the cable has come off the stud which is in the transmission linkage. A replacement bushing can be found on E-bay or by e-mailing a seller at the following address:
ieshouston(at)Yahoo.com
Use the ampersand symbol in place of the word "at" when sending an e-mail.
The cost is approximately $10 including s & h.
03 chevy trailblazer gear shfiter moves but truck does not go in gear
This answer will vary with what's wrong and which shop looks at it.
You can buy a shop repair manual. Haynes or Chiltons are the preferred choices as they are your less expensive options.
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buy a haynes repair book at your local parts store it has detailed instrutions
Loose hold down clamp or broken shift cable.
Just below the shift cable and shift lever on top of the trans.drivers side, rear.
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It could be coming from your heater core, may need to repair or replace it.
Adjusting a parking brake cable on a 2003 Toyota Avalon is considered a major repair. The repair should not be done by a person with no prior experience because if the repair is done wrong it can be dangerous. A repair book for the vehicle should instruct the process.