Chevrolet Trailblazer Service Manual page 422

Adjustment
1. Make sure the range selector lever cable is not restricted.
2. Shift the transmission to the park position.
3. Lift the vehicle.
Range selector lever (A), Range selector lever cable bracket (B),
Range selector lever cable (C), Range selector lever cable
retainer (D), Range selector lever cable end (E)
4. Remove the range selector cable from the transmission range selector lever ball
stud.
5. Make sure the range selector lever is in the park position.