GM Service Manual Online
For 1990-2009 cars only
  1. Inspect the shift forks, shafts and levers for wear, fractures or distortion.
  2. Inspect the shift shaft lever bushings for excessive wear, distortion or scoring. Replace components if any of these conditions are present.
  3. Measure shift fork and pad thickness. Replace parts if diameter exceeds 7.4 mm (0.291 in.) for reverse shift fork and 7.5 mm (0.295 in.) for all other shift forks.