Answer

Hello XXXXXXX! Thanks for getting back to me, well let's see if this helps you. My guess is that you have an automatic transmission so here is a description of how to remove it and adjust it. It will show you where some points are for you to check and find where it has come loose:

Shift Cable Replacement

Removal Procedure

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1. Position the steering column transmission shift lever to PARK (P).
2. Apply the parking brake.
3. Remove the front seat. Refer to Seats.
4. Remove the door sill trim plate. Refer to Door Sill Plate Replacement in Interior Trim.
5. Remove the hinge pillar trim panel. Refer to Hinge Pillar Trim Panel Replacement in Interior Trim.
6. Remove the carpet and the carpet retainers on the driver's side to expose the range select lever cable.
7. Remove the steering column filler panel from the steering column.
8. Disconnect the range select lever cable from the steering column shift control.
   

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9. Disconnect the range select lever cable from the retainers on the cab floor pan.
10. Raise the vehicle. Support the vehicle with safety stands. Refer to General Vehicle Lifting and Jacking in General Information.
    

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11. Remove the cable retainer from the transmission mounted bracket. Squeeze the cable retainer while pulling the cable towards the rear of the vehicle.
12. Disconnect the cable end from the transmission range select lever ball stud.
13. Position the transmission range select lever to PARK (P). Rotate the range select lever clockwise until the lever reaches the full clockwise stop position.
    

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14. Remove the range select lever cable from under the fuel line and from the rear transmission bracket.
15. Note the routing of the range select lever cable on the vehicle before removal.
16. Remove the safety stands.
17. Lower the vehicle.
18. Remove the range select lever cable grommet from the floor panel.
19. Remove the range select lever cable from the vehicle.

Installation Procedure

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1. Position the steering column transmission shift lever to PARK (P).
   

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2. Ensure that the transmission is in the mechanical park position. Position the transmission range select lever to PARK (P). Rotate the range select lever clockwise until the lever reaches the full clockwise stop position.
3. Install the range select lever cable to the vehicle. Route the cable in the original location noted during removal.
   

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4. Install the range select lever cable grommet to the floor panel.
5. Install the range select lever cable retainers on the cab floor pan.
   

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6. Install the range select lever cable end to the steering column shift control.
7. Install the steering column filler panel to the steering column.
8. Install the carpet and the carpet retainers on the driver's side.
9. Install the door sill trim plate. Refer to Door Sill Plate Replacement in Interior Trim.
10. Install the hinge pillar trim panel. Refer to Hinge Pillar Trim Panel Replacement in Interior Trim.
11. Install the front seat. Refer to Seats.
12. Make sure that the steering column transmission shift lever is in Park (P).
13. Raise the vehicle. Support the vehicle with safety stands. Refer to General Vehicle Lifting in General Information.
    

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14. Route the range select lever cable under the fuel lines.
15. Connect the range select lever cable to the rear transmission bracket.
16. Install the range select lever cable retainer to the transmission cable bracket.
    

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17. Remove the black shipping clip from the new range select lever cable. Discard the clip.
18. Install the range select lever cable end to the transmission range select lever. Push the cable end onto the transmission range select lever stud ball.
19. Adjust the range select lever cable. Refer to Shift Cable Adjustment .

Shift Cable Adjustment

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1. Position the steering column transmission shift lever to PARK (P).
2. Apply the parking brake.
3. Raise the vehicle. Support the vehicle with safety stands. Refer to Lifting and Jacking the Vehicle in General Information.
   

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4. Position the transmission range select lever to PARK (P). Rotate the range select lever clockwise until it reaches the full mechanical stop position.
   

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5. Slide the black retaining clip forward on the range select lever cable end. This will allow the white lock button to be pushed out.
   

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6. Push the white lock button on the range select lever cable end out. This will free the metal core adjust body which is inside the cable end. Do not push the white lock button completely out.
7. Inspect the metal core adjust body on the cable end for dirt or debris that may restrict the travel. Remove any debris by washing the cable end, the metal core adjust body, and the white lock button with soap and water. If the travel of the metal core adjust body remains restricted after the cleaning, replace the cable assembly. Refer to Shift Cable Replacement .
8. Remove the safety stands.
9. Lower the vehicle.
10. Ensure that the parking brake is applied.
11. Turn ON the ignition switch.
    

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12. Move the transmission shift lever from PARK (P) to 1 and back to PARK (P) ten times.
    

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13. Place the steering column transmission shift lever in the Park (P) position.
14. Turn the ignition switch to the OFF position.
15. Raise the vehicle. Support the vehicle with safety stands.
    

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16. Position the transmission range select lever to PARK (P). Rotate the range select lever clockwise until it reaches the mechanical stop position.
    

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17. Push in the white lock button in order to secure the core adjuster body inside the range select lever cable end.
    

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18. Slide the black retainer clip rearward over the cable end until it covers the white lock button. Lock the clip over the cable end.
19. Remove the safety stands.
20. Lower the vehicle.
21. Turn ON the ignition switch.
22. Ensure that all the transmission shift light positions (P, R, N, D, 3, 2, 1) engaged and illuminate. If you cannot perform this task, repeat the cable adjustment procedures.

    Caution: With the selector lever in the PARK position, the parking pawl should freely engage within the rear reaction internal gear lugs or output ring hear lugs and prevent the vehicle from rolling, which could cause personal injury.

23. Position the steering column transmission shift lever to PARK (P). The shift position light should illuminate. If you cannot perform this task, repeat the cable adjust procedures.
24. Ensure that the engine starts in PARK (P) and in NEUTRAL (N) positions only. If the engine does not start in PARK (P) and in NEUTRAL (N), the Park/Neutral Position Switch may need adjustment. Refer to Park/Neutral Back Up Switch Adjustment .
25. Turn the ignition switch to LOCK.
26. Ensure that the ignition key can only be removed with the transmission shift lever in the PARK (P) position.
27. Start the engine and check the vehicle transmission shifting. The range select lever cable is properly adjusted if the steering column shift light positions are the same as the transmission engagements.
28. Release the parking brake.

Expert:	Jay
Pos. Feedback:	100.0 %
Accepts:
Answered:	11/1/2008

Chevy Mechanic

3 yrs experience, GM Trained,