GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Transmission 🢒 Automatic Transmission - Allison 🢒 Shift Cable Adjustment

Inspection Procedure
  1. Turn the ignition to OFF.
  2. Block the wheels.
  3. Shift the selector lever through each drive range while feeling for full engagement of the transmission.
    4. 3.1. Ensure the shift control fully engages all the transmission detent positions in the transmission before the range selector hits a stop.
    3.2. Note the position of the selector lever after each shift.
    3.3. Ensure the transmission detent R (reverse) does not engage until the selector lever is completely out of the N (neutral) notch.
  4. If the selector lever is not properly located or operating, adjust the shift control cable.
    5. • If you cannot make a satisfactory adjustment, replace the shift cable. Refer to Shift Cable Replacement .
    • Before adjusting the shift cable, ensure that all the shift controls are not damaged and operate smoothly.
    • Have an assistant select the required range selector position while you listen for the full engagement of the gears at the transmission shift lever.

Adjustment Procedure
  1. Place the range selector against the stop in the R (reverse) position.

    2. Object Number: 1247632 Size: SH
  2. Disconnect the clevis from the transmission shift lever.
  3. Position the transmission shift lever into the mechanical reverse position.
  4. Loosen the jam nut at the clevis.
  5. Turn the clevis on the threaded cable core until the holes in the clevis align with the hole in transmission shift lever.
  6. Install the clevis pin.
    7. 6.1. Ensure that the clevis pin enters the holes freely.
    6.2. If the clevis pin does not enter the holes freely, adjust the clevis by turning the clevis one half turn in either direction.

    Important: Do not spread the cotter pin.

  7. Secure the clevis pin to the transmission shift lever with a new cotter pin.
  8. Move the range selector lever in order to check for the detent engagement.
    9. 8.1. Ensure the transmission detents fully engage just before the range selector lever hits the stops in the shift control lever.
    8.2. Verify the detent engagement is in the N (neutral) position.
    8.3. Verify the detent engagement is in the D (drive) position.
    8.4. Verify the detent engagement is in the R (reverse) position.
    8.5. Verify the detent engagement is in all the other range positions.
  9. Tighten the jam nut against the clevis pin.